number.wiki
Number

390

390 is a composite number, even, a calendar year.

Abundant Number Squarefree Year

Properties

Parity
Even
Digit count
3
Digit sum
12
Digital root
3
Palindrome
No
Divisor count
16
σ(n) — sum of divisors
1,008

Primality

Prime factorization: 2 × 3 × 5 × 13

Divisors & multiples

All divisors (16)
1 · 2 · 3 · 5 · 6 · 10 · 13 · 15 · 26 · 30 · 39 · 65 · 78 · 130 · 195 · 390
Aliquot sum (sum of proper divisors): 618
Factor pairs (a × b = 390)
1 × 390
2 × 195
3 × 130
5 × 78
6 × 65
10 × 39
13 × 30
15 × 26
First multiples
390 · 780 · 1,170 · 1,560 · 1,950 · 2,340 · 2,730 · 3,120 · 3,510 · 3,900

Representations

In words
three hundred ninety
Ordinal
390th
Roman numeral
CCCXC
Binary
110000110
Octal
606
Hexadecimal
186

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 390, here are decompositions:

  • 7 + 383 = 390
  • 11 + 379 = 390
  • 17 + 373 = 390
  • 23 + 367 = 390
  • 31 + 359 = 390
  • 37 + 353 = 390
  • 41 + 349 = 390
  • 43 + 347 = 390

Showing the first eight; more decompositions exist.

Unicode codepoint
Ɔ
U+0186
Uppercase letter (Lu)

UTF-8 encoding: C6 86 (2 bytes).

Lookup U+0186 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000186
RGB(0, 1, 134)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.134.