Number 4 facts

The even number 4 is spelled 🔊, and written in words: four. The ordinal number 4th is said 🔊 and written as: fourth. The meaning of the number 4 in Maths: Is it Prime? Factorization and prime factors tree. The square root and cube root of 4. What is 4 in computer science, numerology, codes and images, writing and naming in other languages. Other interesting facts, videos, news related to 4.

What is 4 in other units

The decimal (Arabic) number 4 converted to a Roman number is IV. Roman and decimal number conversions.
The number 4 converted to a Mayan number is mayan number 4
Decimal and Mayan number conversions.

Weight conversion

4 kilograms (kg) = 8.8 pounds (lbs)
4 pounds (lbs) = 1.8 kilograms (kg)

Length conversion

4 kilometers (km) equals to 2.485 miles (mi).
4 miles (mi) equals to 6.437 kilometers (km).
4 meters (m) equals to 6.437 feet (ft).
4 feet (ft) equals 1.219 meters (m).
4 centimeters (cm) equals to 1.6 inches (in).
4 inches (in) equals to 10.2 centimeters (cm).

Temperature conversion

4° Fahrenheit (°F) equals to -15.6° Celsius (°C)
4° Celsius (°C) equals to 39.2° Fahrenheit (°F)

Power conversion

4 Horsepower (hp) equals to 2.94 kilowatts (kW)
4 kilowatts (kW) equals to 5.44 horsepower (hp)

Codes and images of the number 4

Number 4 morse code: ....-
Sign language for number 4: Sign language for number 4
Number 4 in braille:
Number 4 in braille
Images of the number
Image (1) of the numberImage (2) of the number
Number 4 black image Number 4 red image
More images, other sizes, codes and colors ...

Number 4 infographic

Year 4 AD

  • Bak Hyeokgeose of Silla, first ruler of Korea died.
  • Gaius Caesar died.
  • King Phraataces and Queen Musa of Parthia are overthown and killed, the crown being offered to Orodes III of Parthia.
  • Tiberius was chosen by Augustus as emperor of Rome.

Gregorian, Hebrew, Islamic, Persian and Buddhist Year (Calendar)

Gregorian year 4 is Buddhist year 547.
Buddhist year 4 is Gregorian year 539 a. C.
Gregorian year 4 is Islamic year -637 or -636.
Islamic year 4 is Gregorian year 625 or 626.
Gregorian year 4 is Persian year -619 or -618.
Persian year 4 is Gregorian 625 or 626.
Gregorian year 4 is Hebrew year 3764 or 3765.
Hebrew year 4 is Gregorian year 3756 a. C.
The Buddhist calendar is used in Sri Lanka, Cambodia, Laos, Thailand, and Burma. The Persian calendar is the official calendar in Iran and Afghanistan.

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Mathematics of no. 4


Multiplication table of 4

4 multiplied by two equals 8 (4 x 2 = 8).
4 multiplied by three equals 12 (4 x 3 = 12).
4 multiplied by four equals 16 (4 x 4 = 16).
4 multiplied by five equals 20 (4 x 5 = 20).
4 multiplied by six equals 24 (4 x 6 = 24).
4 multiplied by seven equals 28 (4 x 7 = 28).
4 multiplied by eight equals 32 (4 x 8 = 32).
4 multiplied by nine equals 36 (4 x 9 = 36).
show multiplications by 6, 7, 8, 9 ...

Fractions: decimal fraction and common fraction

Fraction table of 4

Half of 4 is 2 (4 / 2 = 2).
One third of 4 is 1,3333 (4 / 3 = 1,3333 = 1 1/3).
One quarter of 4 is 1 (4 / 4 = 1).
One fifth of 4 is 0,8 (4 / 5 = 0,8 = 4/5).
One sixth of 4 is 0,6667 (4 / 6 = 0,6667 = 2/3).
One seventh of 4 is 0,5714 (4 / 7 = 0,5714 = 4/7).
One eighth of 4 is 0,5 (4 / 8 = 0,5 = 1/2).
One ninth of 4 is 0,4444 (4 / 9 = 0,4444 = 4/9).
show fractions by 6, 7, 8, 9 ...



Advanced math operations

Is Prime?

The number 4 is not a prime number. The closest prime numbers are 3, 5.
The 4th prime number in order is 7.

Factorization and factors (dividers)

The prime factors of 4 are 22 or 2^2 or 2**2
The factors of 4 are 1, 2, 4.
Total factors 3.
Sum of factors 7 (3).

Prime factor tree


The second power of 42 is 16.
The third power of 43 is 64.


The square root √4 is 2 exact square root.
The cube root of 34 is 1,587401.


The natural logarithm of No. ln 4 = loge 4 = 1,386294.
The logarithm to base 10 of No. log10 4 = 0,60206.
The Napierian logarithm of No. log1/e 4 = -1,386294.

Trigonometric functions

The cosine of 4 is -0,653644.
The sine of 4 is -0,756802.
The tangent of 4 is 1,157821.

Number 4 in Computer Science

Code typeCode value
Unix timeUnix time 4 is equal to Thursday Jan. 1, 1970, 12:04 a.m. GMT
IPv4, IPv6Number 4 internet address in dotted format v4, v6 ::4
4 Decimal = 100 Binary
4 Decimal = 11 Ternary
4 Decimal = 4 Octal
4 Decimal = 4 Hexadecimal (0x4 hex)
4 BASE64NA==
4 MD5a87ff679a2f3e71d9181a67b7542122c
4 SHA11b6453892473a467d07372d45eb05abc2031647a
4 SHA224271f93f45e9b4067327ed5c8cd30a034730aaace4382803c3e1d6c2f
4 SHA2564b227777d4dd1fc61c6f884f48641d02b4d121d3fd328cb08b5531fcacdabf8a
4 SHA384bcf6e0ebc8c5185372c8d8f0f449727bd52c5284860f1c46ea53dc943fabf40c75067629813f12bd994d75a39f44843d
More SHA codes related to the number 4 ...

If you know something interesting about the 4 number that you did not find on this page, do not hesitate to write us here.

Numerology 4

The number four (4) came to establish stability and to follow the process in the world. It needs to apply a clear purpose to develop internal stability. It evokes a sense of duty and discipline. Number 4 personality speaks of solid construction. It teaches us to evolve in the tangible and material world, to develop reason and logic and our capacity for effort, accomplishment and work.

4Hz Natural detoxifying effect

Immunity increase frequency, helpful for inner healing.

This number has the will and effort to carry out the projects well. Number 4 person is honest and very responsible, with a strong sense of order and values. It is the sign of practicality, loyalty, rigidity and repression. It is also a symbol of creation, of fighting against limits, of scientific mentality, attention to detail, capable of achieving important achievements and with ingenuity for the organization. People described with number four have fine administrative skills and respect for the law, order and justice in general. Their legal action provides them with personal authority, the fulfillment of their obligations and the achievement of successes and positions of responsibility in the highest spheres of society. Read more ...

Interesting facts about the number 4


  • (4) Vesta is asteroid number 4. It was discovered by H. W. M. Olbers from Bremen on 3/29/1807.

Aircrafts and flights

  • 05/26/1991 the Lauda Air plane, flight number 004, Boeing 767-3Z9ER crashed in Phu Toei National Park, Thailand 213 passengers and 10 crew members died.
  • 08/15/1958 the Aeroflot plane, flight number 4, Tupolev Tu-104A crashed in near Chita, Russia 53 passengers and 11 crew members died.
  • 01/15/1966 the Avianca plane, flight number 4, Douglas C-54 crashed in Cartagena Bay, off Cartagena, Colombia 52 passengers and 4 crew members died.

Areas, mountains and surfaces

  • The total area of Madagascar (main island) is 226,658 square miles (587,041 square km). Country Madagascar. 4th largest island in the world.



  • Fingernails grow 4 times faster than toenails.
  • There are 4 embryonic tissues: endoderm, cerebellar mesoderm, cerebral mesoderm, ectoderm.
  • There are 4 types of blood: 0, A, B, AB
  • There are 4 nucleotides in DNA: Thymine, Adenine, Cytosine, and Guanine.


  • Connect Four (Connect 4) is a two-player connection board game, in which the players choose a color and then take turns dropping colored tokens into a seven-column, six-row vertically suspended grid. The pieces fall straight down, occupying the lowest available space within the column. The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four of one's own tokens.
  • Pokémon Charmander (Hitokage) is a Pokémon number # 004 of the National Pokédex. Charmander is a fire-type Pokémon in the first generation. It is a Monster and Dragon Egg group Pokémon. Charmander's other indexes are Kalos Centro index 083 - Central Zone Pokédex, Johto index 229 .

History and politics

  • United Nations Security Council Resolution number 4, adopted 29 April 1946. Condemning Francoist Spain. Resolution text.

In other fields

  • There are four cardinal points (north, south, east, west).
  • It represents the universal truth.
  • There are 4 seasons of the year: spring, fall, winter and summer.
  • There are 4 types of temperaments of the human being according to psychology: Phlegmatic, Choleric, Sanguineous and Melancholic.
  • There are 4 Earthly Elements and Chakras: Earth, Water, Fire and Air.


  • Chuck Norris once won a game of Connect Four in 3 moves!


  • 4 is the 2nd centered triangular number

    Example of 4th centered triangular number with 19 dots.
  • 4 is the only compositorial square
  • 4 is the only positive number that is both the sum and the product of the same two integers
  • 4 is the smallest number of colors sufficient to color all planar maps.


  • Maluma - Felices los 4 (Official Video)
  • '4 sekunder' is a song written by Magnus Uggla and Anders Henriksson. '4 Segundo' is a song by Amaia Montero.
  • '4 Seasons of Loneliness', in Spanish '4 seasons of loneliness' is an R&B and pop ballad recorded by the Philadelphia-based vocal quartet, Boyz II Men.
  • 'Mercury4' is an Australian youth band based in Melbourne.
  • '4 Words', in Spanish '4 Palabras', is a song by the Welsh band 'Bullet for My Valentine'.
  • '4 Minutes', in Spanish '4 minutes', is a song by the American singer Avant. It is also the name of the song of the American singer-songwriter Madonna.
  • More music ...
  • '4 Peynirli Pizza' is a pop song by the Hepsi group.
  • '4 Real' is a song by Canadian singer-songwriter Avril Lavigne.
  • '4 Years Old', in Spanish '4 years old', is a song by the American singer Chris Brown.
  • '4 Carats', in Spanish '4 carats', is a song by the American artist Kelly Clarkson.
  • '4x4' is a song by the American artist Miley Cyrus with the performance of the American rapper Nelly.
  • '4 Walls', in Spanish '4 Walls', is a song recorded by the South Korean girl group f (x) for their fourth studio album of the same title.
  • '4 Degrees', in Spanish '4 degrees', is a song by the British-American artist Anohni.
  • '4 Wheel Drive' is a song by by American country musician Granger Smith.


  • There are 4 great prophets, Isaiah, Jeremiah, Ezekiel and Daniel.
  • There are 4 horsemen of the apocalypse.
  • There are 4 Angels ready in the 4 corners of the Earth.
  • There are 4 Gospels.
  • There are 4 living beasts in Ezekiel, Daniel, and Revelation.
  • It is the number of pluralism, the paganism of many gods begins here, the Tetragrammaton, the four letters of the name of God.
  • More religions ...
  • 4 are the seeds of the Parable of the Sower, according to Christ.
  • There are 4 Spiritual Paths of Man, according to Gurdief: The Way of the Fakir, the Way of the Monk, the Way of the Yogi, and the Fourth Way.


  • There are 4 elements in quantum: Strong Nuclear Force, Weak Nuclear Force, Electromagnetism, and Gravitation.
  • There are 4 Brains, according to Medical Neurosciences: The Neurobiotic (or microbiotic brain), the Neuroenteric (or intestinal brain), the Neuroencephalus (or encephalic brain), and the Neurocardium (or cardiac brain).
  • Beryllium is the chemical element in the periodic table that has the symbol Be and atomic number 4.


  • The best athletes to wear number 4
    Lou Gehrig, MLB; Brett Favre, NFL; Bobby Orr, NHL; Mel Ott, MLB; Duke Snider, MLB, Paul Molitor, MLB


  • In hospitals in Japan, using the number 4 as a room number is avoided because its pronunciation "shi" is the same as the word "death."


  • '4 bits' is used in computer architecture to describe integers, memory addresses or other units of data that are up to 4 bits wide, or to refer to a CPU and ALU architecture based on registers, address bus or bus. data of that width.

№ 4 in other languages

How to say or write the number four in Spanish, German, French and other languages.
Spanish: 🔊 (número 4)


German: 🔊 (Nummer 4)


French: 🔊 (nombre 4)


Portuguese: 🔊 (número 4)


Hindi: 🔊 (संख्या 4)


Chinese: 🔊 (数 4)

Arabian: 🔊 (عدد 4)


Czech: 🔊 (číslo 4)


Korean: 🔊 (번호 4)

Danish: 🔊 (nummer 4)


Hebrew: (מספר 4)


Dutch: 🔊 (nummer 4)


Japanese: 🔊 (数 4)

Indonesian: 🔊 (jumlah 4)


Italian: 🔊 (numero 4)


Norwegian: 🔊 (nummer 4)


Polish: 🔊 (liczba 4)


Russian: 🔊 (номер 4)


Turkish: 🔊 (numara 4)


Thai: 🔊 (จำนวน 4)


Ukrainian: 🔊 (номер 4)


Vietnamese: 🔊 (con số 4)


Other languages ...

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Number 4 in News

NASA: 50 Years Ago: Launch of Skylab 4, The Final Mission to Skylab
The third and final crewed mission to the Skylab space station, Skylab 4, got underway on Nov. 16, 1973, with a thunderous launch from NASA’s Kennedy Space Center (KSC) in Florida. Docking eight hours later, astronauts Gerald P. Carr, Edward G. Gibson, and William R. Pogue began a planned 56-day …
Nov. 16, 2023

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