Number
818
818 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 17
- Digital root
- 8
- Palindrome
- Yes
- Divisor count
- 4
- σ(n) — sum of divisors
- 1,230
Primality
Prime factorization: 2 × 409
Divisors & multiples
Aliquot sum (sum of proper divisors):
412
Representations
- In words
- eight hundred eighteen
- Ordinal
- 818th
- Roman numeral
- DCCCXVIII
- Binary
- 1100110010
- Octal
- 1462
- Hexadecimal
- 332
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 818, here are decompositions:
- 7 + 811 = 818
- 31 + 787 = 818
- 61 + 757 = 818
- 67 + 751 = 818
- 79 + 739 = 818
- 109 + 709 = 818
- 127 + 691 = 818
- 157 + 661 = 818
Showing the first eight; more decompositions exist.
Unicode codepoint
̲
U+0332
Non-spacing mark (Mn)
UTF-8 encoding: CC B2 (2 bytes).
Hex color
#000332
RGB(0, 3, 50)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.50.