The Natural Number 18

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Properties of the Number 18

  • Because 18 is divisible by 2 ...
    • 18 is an even number
    • 18 has parity 0
    • 18 is not an odd number
  • Because 18 can be factored as 2 x 9 ...
    • 18 is a composite number
    • 18 is not a prime number

Alternative Representations of the Number 18

  • Base 2 (binary): 10010
  • Base 8 (octal): 22
  • Base 16 (hexadecimal): 12
  • Roman numeral: XVIII
  • Words: eighteen

Divisors of the Number 18

  • 18 has 6 positive divisors: 1, 2, 3, 6, 9, 18
    • The sum of the positive divisors is 39
  • 18 has 5 proper divisors: 1, 2, 3, 6, 9
    • The sum of the proper divisors is 21
  • 18 is not a deficient number
  • 18 is not a perfect number
  • 18 is an abundant number since the sum of the proper divisors is greater than 18

More Properties of the Number 18

  • 18 is not a square number
  • 18 is not a cube number
  • 18 is not a palindromic number
  • 18 is not a Fibonacci number
  • 18 is a Lucas number

9:04 pm, Wednesday, March 29, 2017 (UTC; +0000)
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