Number 15

Number 15 is said 🔊, write in letters as follows: fifteen . Ordinal number 15th is said 🔊 and write: fifteenth. The meaning of number 15: Basic maths, advanced mathematics and properties, computer science, numerology, codes and images, writing and naming in other languages, other interesting facts and comments. Number 15 in News.

Useful information about number 15

The decimal (Arabic) number 15 converted to a Roman number is XV. Roman and decimal number conversions.
The number 15 converted to a Mayan number is mayan number 15
Decimal and Mayan number conversions.

Weight conversion

15 kilograms (kg) = 33.1 pounds (lb)
15 pounds (lb) = 6.8 kilograms (kg)

Length conversion

15 kilometers (km) equals to 9.321 miles (mi).
15 miles (mi) equals to 24.140 kilometers (km).
15 meters (m) equals to 24.140 feet (ft).
15 feet (ft) equals 4.572 meters (m).
15 centimeters (cm) equals to 5.9 inches (in).
15 inches (in) equals to 38.1 centimeters (cm).

Temperature conversion

15° Fahrenheit (°F) equals to 59° Celsius (°C)
15° Celsius (°C) equals to -9.4° Fahrenheit (°F)

Power conversion

15 Horsepower (hp) equals to 11.03 kilowatts (kW)
15 kilowatts (kW) equals to 20.40 horsepower (hp)

Codes and images of the number 15

Number 15 morse code: .---- .....
Sign language for number 15:
Sign language for number 15 Sign language for number 15
Images of the number
Image (1) of the numberImage (2) of the number
Number 15 black image Number 15 red image
There is no copyright for these images. Number 15 infographic.
More images, other sizes, codes and colors ...

Photo of number 15

Photo of the number 15

Gregorian, Hebrew, Islamic, Persian and Buddhist year (calendar)

Gregorian year 15 is Buddhist year 558.
Buddhist year 15 is Gregorian year 528 a. C.
Gregorian year 15 is Islamic year -626 or -625.
Islamic year 15 is Gregorian year 636 or 637.
Gregorian year 15 is Persian year -608 or -607.
Persian year 15 is Gregorian 636 or 637.
Gregorian year 15 is Hebrew year 3775 or 3776.
Hebrew year 15 is Gregorian year 3745 a. C.
The Buddhist calendar is used in Sri Lanka, Cambodia, Laos, Thailand, and Burma. The Persian calendar is official in Iran and Afghanistan.

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Mathematics of no. 15


Multiplication table of 15

15 multiplied by two equals 30 (15 x 2 = 30).
15 multiplied by three equals 45 (15 x 3 = 45).
15 multiplied by four equals 60 (15 x 4 = 60).
15 multiplied by five equals 75 (15 x 5 = 75).
show multiplications by 6, 7, 8, 9 ...

Fractions: decimal fraction and common fraction

Fraction table of 15

Half of 15 is 7,5 (15 / 2 = 7,5 = 7 1/2).
One third of 15 is 5 (15 / 3 = 5).
One quarter of 15 is 3,75 (15 / 4 = 3,75 = 3 3/4).
One fifth of 15 is 3 (15 / 5 = 3).
show fractions by 6, 7, 8, 9 ...



Advanced math operations

Is Prime?

The number 15 is not a prime number. The closest prime numbers are 13, 17.
15th prime number in order is 47.

Factorization and dividers

Factorization 3 * 5 = 15
Divisors of number 15 are 1 , 3 , 5 , 15
Total Divisors 4.
Sum of Divisors 24.


The second power of 152 is 225.
The third power of 153 is 3.375.


The square root √15 is 3,872983.
The cube root of 315 is 2,466212.


The natural logarithm of No. ln 15 = loge 15 = 2,70805.
The logarithm to base 10 of No. log10 15 = 1,176091.
The Napierian logarithm of No. log1/e 15 = -2,70805.

Trigonometric functions

The cosine of 15 is -0,759688.
The sine of 15 is 0,650288.
The tangent of 15 is -0,855993.

Properties of the number 15

Is a Friedman number: No
Is a Fibonacci number: No
Is a Bell number: Yes
Is a palindromic number: No
Is a pentagonal number: No
Is a perfect number: No

Number 15 in Computer Science

Code typeCode value
Unix timeUnix time 15 is equal to Thursday Jan. 1, 1970, 12:15 a.m. GMT
IPv4, IPv6Number 15 internet address in dotted format v4, v6 ::f
15 Decimal = 1111 Binary
15 Decimal = 120 Ternary
15 Decimal = 17 Octal
15 Decimal = F Hexadecimal (0xf hex)
15 MD59bf31c7ff062936a96d3c8bd1f8f2ff3
15 SHA1f1abd670358e036c31296e66b3b66c382ac00812
More SHA codes related to the number 15 ...

Numerology 15

The meaning of the number 5 (five), numerology 5

Character frequency 5: 1

The number five (5) came to this world to achieve freedom. You need to apply discipline to find your inner freedom and open-mindedness. It is about a restless spirit in constant search of the truth that surrounds us. You need to accumulate as much information as possible to know what is happening in depth. Number 5 person is intelligent, selfish, curious and with great artistic ability. It is the symbol of freedom, independence, change, adaptation, movement, the search for new experiences, the traveling and adventurous spirit, but also of inconsistency and abuse of the senses.
More about the meaning of the number 5 (five), numerology 5 ...

The meaning of the number 1 (one), numerology 1

Character frequency 1: 1

Number one (1) came to develop or balance creativity, independence, originality, self-reliance and confidence in the world. It reflects power, creative strength, quick mind, drive and ambition. It is the sign of individualistic and aggressive nature.
More about the meaning of the number 1 (one), numerology 1 ...

Interesting facts about the number 15


  • (15) Eunomia is asteroid number 15. It was discovered by A. de Gasparis from Obs. Capodimonte Astronomical on 7/29/1851.

Aircrafts and flights

  • 02/29/1968 the Aeroflot plane, flight number 15, Ilyushin Il-18D crashed in Parchum, Chunsky District, Russia 74 passengers and 9 crew members died.
  • The North American X-15 was a rocket aircraft that was part of the X series of experimental aircraft used by the USAF, NASA, and the USN. The X-15 achieved several speed and altitude marks in the early 1960s, reaching the limit with outer space (the Kármán line) and obtaining information that would be used in the design of aircraft and spacecraft later.

Areas, mountains and surfaces

  • The total area of Luzon is 42,458 square miles (109,965 square km). Country Philippines (Bicol, Cagayan Valley, Calabarzon, Central Luzon, Cordillera, Ilocos, and the National Capital Region). 15th largest island in the world.


Distances between cities

  • There is a 15 miles (23 km) direct distance between Brooklyn (USA) and The Bronx (USA).
  • There is a 15 miles (24 km) direct distance between Ciudad Nezahualcoyotl (Mexico) and Ecatepec (Mexico).
  • There is a 15 miles (23 km) direct distance between Ecatepec (Mexico) and Naucalpan de Juárez (Mexico).
  • There is a 15 miles (24 km) direct distance between Goyang-si (South Korea) and Incheon (South Korea).
  • There is a 15 miles (24 km) direct distance between Jakarta (Indonesia) and Tangerang (Indonesia).
  • There is a 15 miles (24 km) direct distance between Saitama (Japan) and Tokyo (Japan).

In other fields

  • Dreaming of the number 15 means an alert to get away from the lie.


  • 15 is the smallest composite number n with the property that there is only one group of order n.


  • '15 Feet of Snow ', in Spanish '15 feet of snow', is a song by the Australian rock musician, Diesel.
  • '15 Seconds' on a single by the American indie pop band Ivy.
  • '15 Minutes of Shame ', in Spanish' '15 Minutes of Shame ', is the debut song written by Kelly Archer, Casey Kessel and Justin Weaver, recorded by American country music artist Kristy Lee Cook.
  • '15 Minutes' is the name of a song by the American country singer Rodney Atkins, as well as the British group The Yeah You's.
  • '15 Minutes to Fame ', in Spanish '15 Minutes to Fame', is a song by the American rock band Saving Abel.


  • In the Hebrew numbering system, the number 15 is not written according to the usual method, with the letters representing '10' and '5', because those spell one of God's Jewish names. Instead, the date is written with the letters representing '9' and '6'


  • Phosphorus is the chemical element in the periodic table that has the symbol P and atomic number 15.
  • Group 15 of the periodic table is sometimes known as pnictogens.


  • The best athletes to wear number 15
    Bart Starr, NFL; Thurman Munson, MLB; Carmelo Anthony, NBA; Hal Greer, NBA; Earl Monroe, NBA
  • Rugby. Each team has 15 players on the field at any one time.
  • In tennis, the number 15 represents the first point won in a game.

Number 15 in other languages

How to say or write the number fifteen in Spanish, German, French and other languages.
Spanish: 🔊 (número 15)


German: 🔊 (Anzahl 15)


French: 🔊 (nombre 15)


Portuguese: 🔊 (número 15)


Chinese: 🔊 (数 15)


Other languages ...

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Number 15 in News

CNN: Giant hot air balloon whales and 15 other outdoor art exhibits to see around the world
After Covid-19 shuttered museums and galleries across the globe, the art world is staging a cautious reopening -- which includes a host of new pandemic-friendly, open-air exhibitions and installations. ...
June 2, 2021
CNN: At least 15 dead and thousands displaced after DRC volcanic eruption
At least 15 people have died and hundreds of children were feared missing or separated from their families Monday after Mount Nyiragongo erupted in the eastern Democratic Republic of Congo (DRC) over the weekend. ...
May 24, 2021
BBC: Week in pictures: 15 - 21 May 2021
A selection of powerful images taken around the world this week. ...
May 22, 2021
The Sydney Morning Herald: At least 15 dead, including children, after Bangladesh Rohingya camp fire
At least 400 people were still missing and around 560 were injured after a devastating fire that destroyed thousands of shelters at a Rohingya refugee camp in southern Bangladesh. ...
March 23, 2021
BBC: Low to leave role as Germany manager after 15 years following Euros
Germany manager Joachim Low will step down from his role after this summer's European Championships. ...
March 9, 2021

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