1,818
1,818 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 18
- Digital root
- 9
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,978
Primality
Prime factorization: 2 × 3 2 × 101
Divisors & multiples
Representations
- In words
- one thousand eight hundred eighteen
- Ordinal
- 1818th
- Roman numeral
- MDCCCXVIII
- Binary
- 11100011010
- Octal
- 3432
- Hexadecimal
- 71A
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1818, here are decompositions:
- 7 + 1811 = 1818
- 17 + 1801 = 1818
- 29 + 1789 = 1818
- 31 + 1787 = 1818
- 41 + 1777 = 1818
- 59 + 1759 = 1818
- 71 + 1747 = 1818
- 97 + 1721 = 1818
Showing the first eight; more decompositions exist.
UTF-8 encoding: DC 9A (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.26.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.