Number
198
198 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 18
- Digital root
- 9
- Palindrome
- No
- Divisor count
- 12
- σ(n) — sum of divisors
- 468
Primality
Prime factorization: 2 × 3 2 × 11
Divisors & multiples
Aliquot sum (sum of proper divisors):
270
Representations
- In words
- one hundred ninety-eight
- Ordinal
- 198th
- Roman numeral
- CXCVIII
- Binary
- 11000110
- Octal
- 306
- Hexadecimal
- C6
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 198, here are decompositions:
- 5 + 193 = 198
- 7 + 191 = 198
- 17 + 181 = 198
- 19 + 179 = 198
- 31 + 167 = 198
- 41 + 157 = 198
- 47 + 151 = 198
- 59 + 139 = 198
Showing the first eight; more decompositions exist.
Unicode codepoint
Æ
U+00C6
Uppercase letter (Lu)
UTF-8 encoding: C3 86 (2 bytes).
Hex color
#0000C6
RGB(0, 0, 198)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.198.