Number
1,998
1,998 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 27
- Digital root
- 9
- Palindrome
- No
- Divisor count
- 16
- σ(n) — sum of divisors
- 4,560
Primality
Prime factorization: 2 × 3 3 × 37
Divisors & multiples
Aliquot sum (sum of proper divisors):
2,562
First multiples
Representations
- In words
- one thousand nine hundred ninety-eight
- Ordinal
- 1998th
- Roman numeral
- MCMXCVIII
- Binary
- 11111001110
- Octal
- 3716
- Hexadecimal
- 7CE
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1998, here are decompositions:
- 5 + 1993 = 1998
- 11 + 1987 = 1998
- 19 + 1979 = 1998
- 47 + 1951 = 1998
- 67 + 1931 = 1998
- 97 + 1901 = 1998
- 109 + 1889 = 1998
- 127 + 1871 = 1998
Showing the first eight; more decompositions exist.
Unicode codepoint
ߎ
U+07CE
Other letter (Lo)
UTF-8 encoding: DF 8E (2 bytes).
Hex color
#0007CE
RGB(0, 7, 206)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.206.