Number 18

Names of 18

Nominal 18
Cardinal eighteen
Ordinal 18th
This number as US currency eighteen dollars

Properties (and some facts) of 18

Is 18 an odd number? 18 is NOT an odd number
Is 18 an even number? 18 is an even number
Is 18 a palindrome? 18 is NOT a palindrome number
Is 18 a triangle number? 18 is NOT a triangle number

18 in other Bases

Base 2 (Binary) 100102
Base 3 (Ternary) 2003
Base 4 (Quaternary) 1024
Base 5 (Quinary) 335
Base 6 (Senary) 306
Base 8 (Octal) 228
Base 12 (Duodecimal) 1612
Base 16 (Hexadecimal) 1216
Base 20 (Vigesimal) I20

Primes and Factors tests for 18

Is 18 a Prime Number? 18 is NOT a prime
Is 18 a perfect number? 18 is NOT a perfect number
Is 18 a Mersenne Prime? 18 is NOT a Mersenne prime
Is 18 a Fermat Prime? 18 is NOT a Fermat prime
Is 18 a Fibonacci Prime? 18 is NOT a Fibonacci prime
Is 18 a Partition Prime? 18 is NOT a Partition prime
Is 18 a Pell Prime? 18 is NOT a Pell prime
Prime Factors Prime factors of 18

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18 in other Numerals

18 in Roman Numeral XVIII
18 in Chinese Numeral 壹拾捌
18 in Egyptian Numeral 𓎆𓐁
18 in Babylonian Numeral 18  

Roots and stuff for 18

Is 18 a square number? 18 is NOT a square number
Is 18 a cube number? 18 is NOT a cube number
Square root of the number 18 4.2426406871193
Cube root of the number 18 2.6207413942089

Recreational math for 18

Number 18 reversed 81
Sum of the digits 9
No of digits 2