18
Number 18 properties
- 18 is an even number.
- 18 is a Harshad number, which means it is divisible by the sum of its digits (18 = 9, and 18 is divisible by 9).
Number 18 - properties and curiosities
18 (number)
Prime factorization
Prime factorization of 18: 2 × 3^2.
Divisors
Divisor count: 6
1, 2, 3, 6, 9, 18
Factors of 18 are: 1, 2, 3, 6, 9, 18.
Representations
In octal, 18 is represented as 22.
In binary, 18 is represented as 10010.
In hex, 18 is represented as 12.
Roman numeral: XVIII
Curiosities
- 18 is divisible by the sum of its digits.
Related numbers
Quick answers
Is 18 prime?
No, 18 is not prime.
What are the factors of 18?
1, 2, 3, 6, 9, 18
What is 18 in binary?
10010