Number
1,990
1,990 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 19
- Digital root
- 1
- Palindrome
- No
- Divisor count
- 8
- σ(n) — sum of divisors
- 3,600
Primality
Prime factorization: 2 × 5 × 199
Divisors & multiples
Aliquot sum (sum of proper divisors):
1,610
First multiples
Representations
- In words
- one thousand nine hundred ninety
- Ordinal
- 1990th
- Roman numeral
- MCMXC
- Binary
- 11111000110
- Octal
- 3706
- Hexadecimal
- 7C6
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1990, here are decompositions:
- 3 + 1987 = 1990
- 11 + 1979 = 1990
- 17 + 1973 = 1990
- 41 + 1949 = 1990
- 59 + 1931 = 1990
- 83 + 1907 = 1990
- 89 + 1901 = 1990
- 101 + 1889 = 1990
Showing the first eight; more decompositions exist.
Unicode codepoint
߆
U+07C6
Decimal digit (Nd)
UTF-8 encoding: DF 86 (2 bytes).
Hex color
#0007C6
RGB(0, 7, 198)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.198.