# 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 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:  Images of the number Image (1) of the number Image (2) of the number  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.

## Share in social networks ## 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

#### 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 SHA19e6a55b6b4563e652a23be9d623ca5055c356940
18 SHA2564ec9599fc203d176a301536c2e091a19bc852759b255bd6818810a42c5fed14a
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 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.

### 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 ...

## News to email

Privacy Policy.

## Comment

If you know something interesting about the number 18 or any natural number (positive integer) please write us here or on facebook.