Number 18 facts
The even number 18 is spelled 🔊, and written in words: eighteen. The ordinal number 18th is said 🔊 and written as: eighteenth. The meaning of the number 18 in Maths: Is it Prime? Factorization and prime factors tree. The square root and cube root of 18. What is 18 in computer science, numerology, codes and images, photo art, writing and naming in other languages. Other interesting facts, videos, news related to 18. ‹‹ 17 19 ››
Interesting facts about the number 18
More photos ...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
- It is one of the lucky numbers for the zodiac sign Gemini.
- What is astrology and what is it for?
Distances
- 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).
- More distances ...
- There is a 18 miles (28 km) direct distance between Kowloon (Hong Kong) and Shenzhen (China).
Games
History and politics
- United Nations Security Council Resolution number 18, adopted 13 February 1947. Creation of a commission relating to armament regulation and reduction. Resolution text.
- 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 smallest difference between an emirp and its reverse
- 18 is the only positive number that is twice the sum of its digits.
Music
- One Direction - 18 (Audio)
- '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
Please write us
If you know something interesting about the number 18 or any natural number (positive integer), please write to us.What is 18 in other units
The decimal (Arabic) number 18 converted to a Roman number is XVIII.
Roman and decimal number conversions.
18 kilograms (kg) = 39.7 pounds (lbs)
18 pounds (lbs) = 8.2 kilograms (kg)
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).
18° Fahrenheit (°F) equals to -7.8° Celsius (°C)
18° Celsius (°C) equals to 64.4° Fahrenheit (°F)
18 Horsepower (hp) equals to 13.24 kilowatts (kW)
18 kilowatts (kW) equals to 24.48 horsepower (hp)
| The number 18 converted to a Mayan number is |
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| Decimal and Mayan number conversions. |
Weight conversion
18 kilograms (kg) = 39.7 pounds (lbs)
18 pounds (lbs) = 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:
Number 18 in braille:
| Images of the number | |
| Image (1) of the number | Image (2) of the number |
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| More images, other sizes, codes and colors ... | |
Number 18 infographic
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Year 18 AD
- Caiaphas became the high priest of Jerusalem.
- Strabo wrote Geographia
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 the official calendar in Iran and Afghanistan.
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Advanced math operations
Is Prime?
The number 18 is not a prime number. The closest prime numbers are 17, 19.
The 18th prime number in order is 61.
Factorization and factors (dividers)
The prime factors of 18 are 2 * 3 * 3
The factors of 18 are 1, 2, 3, 6, 9, 18.
Total factors 6.
Sum of factors 39 (21).
Prime factor tree
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 3√18 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.
Number 18 in Computer Science
| Code type | Code value |
|---|---|
| Port 18/TCP, UDP | Message Send Protocol |
| Unix time | Unix time 18 is equal to Thursday Jan. 1, 1970, 12:18 a.m. GMT |
| IPv4, IPv6 | Number 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 BASE64 | MTg= |
| 18 MD5 | 6f4922f45568161a8cdf4ad2299f6d23 |
| 18 SHA1 | 9e6a55b6b4563e652a23be9d623ca5055c356940 |
| 18 SHA224 | 958d155f6746e8f18d32a710f206d83f272919fdba3df5c5ad4bc4fd |
| 18 SHA256 | 4ec9599fc203d176a301536c2e091a19bc852759b255bd6818810a42c5fed14a |
| 18 SHA384 | fdca2073cb2a84421cb63f9aa92c939c8d35359ec9fbc5c06c84ad80b863ed29589adda6f2ee3cf26e277885804848f5 |
| More SHA codes related to the number 18 ... | |
If you know something interesting about the 18 number that you did not find on this page, do not hesitate to write us here.
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 the number 8 (eight), numerology 8
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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 the number 1 (one), numerology 1
...
№ 18 in other languages
How to say or write the number eighteen in Spanish, German, French and other languages.
| Spanish: | 🔊 (número 18) | dieciocho |
| German: | 🔊 (Nummer 18) | achtzehn |
| French: | 🔊 (nombre 18) | dix-huit |
| Portuguese: | 🔊 (número 18) | dezoito |
| Hindi: | 🔊 (संख्या 18) | अट्ठारह |
| 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) | שמונה 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) | вісімнадцять |
| Vietnamese: | 🔊 (con số 18) | mười tám |
| Other languages ... | ||
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Frequently asked questions about the number 18
How do you write the number 18 in words?
18 can be written as "eighteen".
Number 18 in News
| BBC: ‘Once my autistic son turns 18, his support ends’
Parents tell politicians about the "cliff-edge" their children face when they leave school. Nov. 19, 2024 |
| NyTimes: Man Charged for South Africa Mass Shooting that Killed 18 People
The killings of 18 members of one family assembled for a gathering last month are among an increasing number of mass shootings in South Africa. Oct. 10, 2024 |
| NyTimes: Fire at School Dormitory in Kenya Kills at Least 18 Students
At least 70 students are still unaccounted for, although officials urged people not to jump to conclusions about their fate. Sept. 6, 2024 |
| BBC: Universal credit claimants must seek 18 hours work
Changes to welfare rules mean universal credit claimants must look for ways to earn more than before. May 12, 2024 |
| BBC: Ukraine visa schemes to be extended by 18 months
It means those on the earliest visas will be allowed to stay in the UK until at least September 2026. Feb. 18, 2024 |