number.wiki
Number

1,840

1,840 is a composite number, even, a calendar year.

Abundant Number Year

Properties

Parity
Even
Digit count
4
Digit sum
13
Digital root
4
Palindrome
No
Divisor count
20
σ(n) — sum of divisors
4,464

Primality

Prime factorization: 2 4 × 5 × 23

Divisors & multiples

All divisors (20)
1 · 2 · 4 · 5 · 8 · 10 · 16 · 20 · 23 · 40 · 46 · 80 · 92 · 115 · 184 · 230 · 368 · 460 · 920 · 1840
Aliquot sum (sum of proper divisors): 2,624
Factor pairs (a × b = 1,840)
1 × 1840
2 × 920
4 × 460
5 × 368
8 × 230
10 × 184
16 × 115
20 × 92
23 × 80
40 × 46
First multiples
1,840 · 3,680 · 5,520 · 7,360 · 9,200 · 11,040 · 12,880 · 14,720 · 16,560 · 18,400

Representations

In words
one thousand eight hundred forty
Ordinal
1840th
Roman numeral
MDCCCXL
Binary
11100110000
Octal
3460
Hexadecimal
730

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1840, here are decompositions:

  • 17 + 1823 = 1840
  • 29 + 1811 = 1840
  • 53 + 1787 = 1840
  • 107 + 1733 = 1840
  • 131 + 1709 = 1840
  • 173 + 1667 = 1840
  • 227 + 1613 = 1840
  • 233 + 1607 = 1840

Showing the first eight; more decompositions exist.

Unicode codepoint
ܰ
U+0730
Non-spacing mark (Mn)

UTF-8 encoding: DC B0 (2 bytes).

Lookup U+0730 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000730
RGB(0, 7, 48)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.48.