Number
842
842 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 14
- Digital root
- 5
- Palindrome
- No
- Divisor count
- 4
- σ(n) — sum of divisors
- 1,266
Primality
Prime factorization: 2 × 421
Divisors & multiples
Aliquot sum (sum of proper divisors):
424
Representations
- In words
- eight hundred forty-two
- Ordinal
- 842nd
- Roman numeral
- DCCCXLII
- Binary
- 1101001010
- Octal
- 1512
- Hexadecimal
- 34A
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 842, here are decompositions:
- 3 + 839 = 842
- 13 + 829 = 842
- 19 + 823 = 842
- 31 + 811 = 842
- 73 + 769 = 842
- 103 + 739 = 842
- 109 + 733 = 842
- 151 + 691 = 842
Showing the first eight; more decompositions exist.
Unicode codepoint
͊
U+034A
Non-spacing mark (Mn)
UTF-8 encoding: CD 8A (2 bytes).
Hex color
#00034A
RGB(0, 3, 74)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.74.