Number
1,218
1,218 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 12
- Digital root
- 3
- Palindrome
- No
- Divisor count
- 16
- σ(n) — sum of divisors
- 2,880
Primality
Prime factorization: 2 × 3 × 7 × 29
Divisors & multiples
Aliquot sum (sum of proper divisors):
1,662
First multiples
Representations
- In words
- one thousand two hundred eighteen
- Ordinal
- 1218th
- Roman numeral
- MCCXVIII
- Binary
- 10011000010
- Octal
- 2302
- Hexadecimal
- 4C2
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1218, here are decompositions:
- 5 + 1213 = 1218
- 17 + 1201 = 1218
- 31 + 1187 = 1218
- 37 + 1181 = 1218
- 47 + 1171 = 1218
- 67 + 1151 = 1218
- 89 + 1129 = 1218
- 101 + 1117 = 1218
Showing the first eight; more decompositions exist.
Unicode codepoint
ӂ
U+04C2
Lowercase letter (Ll)
UTF-8 encoding: D3 82 (2 bytes).
Hex color
#0004C2
RGB(0, 4, 194)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.194.