Number
1,642
1,642 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 13
- Digital root
- 4
- Palindrome
- No
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,466
Primality
Prime factorization: 2 × 821
Divisors & multiples
Aliquot sum (sum of proper divisors):
824
First multiples
Representations
- In words
- one thousand six hundred forty-two
- Ordinal
- 1642nd
- Roman numeral
- MDCXLII
- Binary
- 11001101010
- Octal
- 3152
- Hexadecimal
- 66A
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1642, here are decompositions:
- 5 + 1637 = 1642
- 23 + 1619 = 1642
- 29 + 1613 = 1642
- 41 + 1601 = 1642
- 59 + 1583 = 1642
- 71 + 1571 = 1642
- 83 + 1559 = 1642
- 89 + 1553 = 1642
Showing the first eight; more decompositions exist.
Unicode codepoint
٪
U+066A
Other punctuation (Po)
UTF-8 encoding: D9 AA (2 bytes).
Hex color
#00066A
RGB(0, 6, 106)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.106.