Number 18

Number 18 spell 🔊, write in words: eighteen . Ordinal number 18th is said 🔊 and write: eighteenth. The meaning of number 18 in Maths: Is Prime? Factorization and dividers. The square root and cube root of 18. The meaning in computer science, numerology, codes and images, writing and naming in other languages, other interesting facts, news.

Useful information about number 18

The decimal (Arabic) number 18 converted to a Roman number is XVIII. Roman and decimal number conversions.
The number 18 converted to a Mayan number is mayan number 18
Decimal and Mayan number conversions.

Weight conversion


18 kilograms (kg) = 39.7 pounds (lb)
18 pounds (lb) = 8.2 kilograms (kg)

Length conversion


18 kilometers (km) equals to 11.185 miles (mi).
18 miles (mi) equals to 28.968 kilometers (km).
18 meters (m) equals to 28.968 feet (ft).
18 feet (ft) equals 5.486 meters (m).
18 centimeters (cm) equals to 7.1 inches (in).
18 inches (in) equals to 45.7 centimeters (cm).

Temperature conversion


18° Fahrenheit (°F) equals to -7.8° Celsius (°C)
18° Celsius (°C) equals to 64.4° Fahrenheit (°F)

Power conversion


18 Horsepower (hp) equals to 13.24 kilowatts (kW)
18 kilowatts (kW) equals to 24.48 horsepower (hp)

Codes and images of the number 18

Number 18 morse code: .---- ---..
Sign language for number 18:
Sign language for number 18 Sign language for number 18
Images of the number
Image (1) of the numberImage (2) of the number
Number 18 black image Number 18 red image
There is no copyright for these images. Number 18 infographic.
More images, other sizes, codes and colors ...

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

Gregorian year 18 is Buddhist year 561.
Buddhist year 18 is Gregorian year 525 a. C.
Gregorian year 18 is Islamic year -623 or -622.
Islamic year 18 is Gregorian year 639 or 640.
Gregorian year 18 is Persian year -605 or -604.
Persian year 18 is Gregorian 639 or 640.
Gregorian year 18 is Hebrew year 3778 or 3779.
Hebrew year 18 is Gregorian year 3742 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. 18

Multiplications

Multiplication table of 18


18 multiplied by two equals 36 (18 x 2 = 36).
18 multiplied by three equals 54 (18 x 3 = 54).
18 multiplied by four equals 72 (18 x 4 = 72).
18 multiplied by five equals 90 (18 x 5 = 90).
18 multiplied by six equals 108 (18 x 6 = 108).
18 multiplied by seven equals 126 (18 x 7 = 126).
18 multiplied by eight equals 144 (18 x 8 = 144).
18 multiplied by nine equals 162 (18 x 9 = 162).
show multiplications by 6, 7, 8, 9 ...

Fractions: decimal fraction and common fraction

Fraction table of 18


Half of 18 is 9 (18 / 2 = 9).
One third of 18 is 6 (18 / 3 = 6).
One quarter of 18 is 4,5 (18 / 4 = 4,5 = 4 1/2).
One fifth of 18 is 3,6 (18 / 5 = 3,6 = 3 3/5).
One sixth of 18 is 3 (18 / 6 = 3).
One seventh of 18 is 2,5714 (18 / 7 = 2,5714 = 2 4/7).
One eighth of 18 is 2,25 (18 / 8 = 2,25 = 2 1/4).
One ninth of 18 is 2 (18 / 9 = 2).
show fractions by 6, 7, 8, 9 ...

Calculator

18

Advanced math operations

Is Prime?


The number 18 is not a prime number. The closest prime numbers are 17, 19.
18th prime number in order is 61.

Factorization and dividers


Factorization 2 * 3 * 3 = 18
Divisors of number 18 are 1 , 2 , 3 , 6 , 9 , 18
Total Divisors 6.
Sum of Divisors 39.

Powers


The second power of 182 is 324.
The third power of 183 is 5.832.

Roots


The square root √18 is 4,242641.
The cube root of 318 is 2,620741.

Logarithms


The natural logarithm of No. ln 18 = loge 18 = 2,890372.
The logarithm to base 10 of No. log10 18 = 1,255273.
The Napierian logarithm of No. log1/e 18 = -2,890372.

Trigonometric functions

The cosine of 18 is 0,660317.
The sine of 18 is -0,750987.
The tangent of 18 is -1,137314.

Properties of the number 18

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

Number 18 in Computer Science

Code typeCode value
Port 18/TCP, UDPMessage Send Protocol
Unix timeUnix time 18 is equal to Thursday Jan. 1, 1970, 12:18 a.m. GMT
IPv4, IPv6Number 18 internet address in dotted format v4 0.0.0.18, v6 ::12
18 Decimal = 10010 Binary
18 Decimal = 200 Ternary
18 Decimal = 22 Octal
18 Decimal = 12 Hexadecimal (0x12 hex)
18 BASE64MTg=
18 MD56f4922f45568161a8cdf4ad2299f6d23
18 SHA19e6a55b6b4563e652a23be9d623ca5055c356940
18 SHA224958d155f6746e8f18d32a710f206d83f272919fdba3df5c5ad4bc4fd
18 SHA2564ec9599fc203d176a301536c2e091a19bc852759b255bd6818810a42c5fed14a
18 SHA384fdca2073cb2a84421cb63f9aa92c939c8d35359ec9fbc5c06c84ad80b863ed29589adda6f2ee3cf26e277885804848f5
More SHA codes related to the number 18 ...

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Numerology 18

The meaning of the number 8 (eight), numerology 8

Character frequency 8: 1

The number eight (8) is the sign of organization, perseverance and control of energy to produce material and spiritual achievements. It represents the power of realization, abundance in the spiritual and material world. Sometimes it denotes a tendency to sacrifice but also to be unscrupulous.
More about the meaning of the number 8 (eight), numerology 8 ...

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 18

Asteroids

  • (18) Melpomene is asteroid number 18. It was discovered by J. R. Hind from George Bishop Observatory on 6/24/1852.

Areas, mountains and surfaces

  • The total area of Iceland (main island) is 39,315 square miles (101,826 square km). Country Iceland. 18th largest island in the world.

Astrology

Distances between cities

  • There is a 18 miles (28 km) direct distance between Delhi (India) and Farīdābād (India).
  • There is a 18 miles (28 km) direct distance between Ecatepec (Mexico) and Iztapalapa (Mexico).
  • There is a 18 miles (28 km) direct distance between Klang (Malaysia) and Kuala Lumpur (Malaysia).
  • There is a 18 miles (28 km) direct distance between Kobe (Japan) and Sakai (Japan).
  • There is a 18 miles (28 km) direct distance between Kowloon (Hong Kong) and Shenzhen (China).

Games

  • Pokémon Pidgeot (Pijotto, Pigeot) is a Pokémon number # 018 of the National Pokédex. Pidgeot is a normal, flying type Pokémon in the first generation. It is a Flying Egg group Pokémon. Pidgeot's other indexes are Johto index 012 , Kalos Centro index 019 - Central Zone Pokédex.

History and politics

  • Nazi symbol. 18, which means Adolf Hitler. The number is due to the position of the letters in the Latin alphabet: A = 1 and H = 8. The list of evil numbers.

In other fields

  • 18 karat gold – 75% pure gold (750 parts per thousand)

Mathematics

  • 18 is the only positive number that is twice the sum of its digits.

Music

  • '18 til I Die ', in Spanish '18 until dying' is a rock song written by Bryan Adams and Robert John 'Mutt' Lange. The song's musical style and production were heavily inspired by rock from the 1980s, and its lyrics are about youth.
  • '18 Days ', in Spanish '18 days', is a single by the American rock band 'Saving Abel'.
  • '18 Video Tapes ', in Spanish '18 videotapes', is a song by country music artist Jason Meadows.

Science

  • Argon is the chemical element in the periodic table that has the symbol Ar and atomic number 18.

Sports

  • The best athletes to wear number 18
    Peyton Manning, NFL; Dave Cowens, NBA; Charlie Joiner, NFL; Denis Savard, NHL; Bobby Labonte, NASCAR

Number 18 in other languages

How to say or write the number eighteen in Spanish, German, French and other languages.
Spanish: 🔊 (número 18)

dieciocho

German: 🔊 (Anzahl 18)

achtzehn

French: 🔊 (nombre 18)

dix-huit

Portuguese: 🔊 (número 18)

dezoito

Chinese: 🔊 (数 18)

十八

Arabian: 🔊 (عدد 18)

ثمانية عشر

Czech: 🔊 (číslo 18)

osmnáct

Korean: 🔊 (번호 18)

십팔

Danish: 🔊 (nummer 18)

atten

Hebrew: (מספר 18)

שמנה עשרה

Dutch: 🔊 (nummer 18)

achttien

Japanese: 🔊 (数 18)

十八

Indonesian: 🔊 (jumlah 18)

delapan belas

Italian: 🔊 (numero 18)

diciotto

Norwegian: 🔊 (nummer 18)

atten

Polish: 🔊 (liczba 18)

osiemnaście

Russian: 🔊 (номер 18)

восемнадцать

Turkish: 🔊 (numara 18)

onsekiz

Thai: 🔊 (จำนวน 18)

สิบแปด

Ukrainian: 🔊 (номер 18)

вiсiмнадцять

Vietnamese: 🔊 (con số 18)

mười tám

Other languages ...

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Number 18 in News

CNN: She flew to Tonga for a weekend, 18 months later she's still stuck there
When British traveler Zoe Stephens flew into the South Pacific island nation of Tonga last March, she was only planning to stay for the weekend. ...
Aug. 18, 2021
France24: Chinese court sentences whistleblowing agricultural tycoon to 18 years in prison
A Chinese court sentenced agricultural tycoon Sun Dawu to 18 years in jail on Wednesday for a catalogue of crimes including “provoking trouble” after the outspoken billionaire and grassroots rights supporter was tried in secret. ...
July 28, 2021
BBC: Jones to rejoin Lions in South Africa, 18 days after dislocating shoulder
Wales captain Alun Wyn Jones is to rejoin the British and Irish Lions squad just 18 days after dislocating his shoulder. ...
July 14, 2021
The Sydney Morning Herald: ‘Little Einstein’: 11yo completes quantum physics degree in 18 months
Laurent started secondary school at six and university at eight. He says he’s “just Laurent”. ...
July 7, 2021
France24: At least 18 killed in shelling attack on opposition-held Syria town
Shelling of the rebel-held city of Afrin in northern Syria killed at least 18 people on Saturday, many of them when a hospital was hit, a war monitor said. ...
June 13, 2021

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