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Number

1,540

1,540 is a composite number, even, a calendar year.

Abundant Number Harshad / Niven Hexagonal Tetrahedral Triangular Year

Properties

Parity
Even
Digit count
4
Digit sum
10
Digital root
1
Palindrome
No
Divisor count
24
σ(n) — sum of divisors
4,032

Primality

Prime factorization: 2 2 × 5 × 7 × 11

Divisors & multiples

All divisors (24)
1 · 2 · 4 · 5 · 7 · 10 · 11 · 14 · 20 · 22 · 28 · 35 · 44 · 55 · 70 · 77 · 110 · 140 · 154 · 220 · 308 · 385 · 770 · 1540
Aliquot sum (sum of proper divisors): 2,492
Factor pairs (a × b = 1,540)
1 × 1540
2 × 770
4 × 385
5 × 308
7 × 220
10 × 154
11 × 140
14 × 110
20 × 77
22 × 70
28 × 55
35 × 44
First multiples
1,540 · 3,080 · 4,620 · 6,160 · 7,700 · 9,240 · 10,780 · 12,320 · 13,860 · 15,400

Representations

In words
one thousand five hundred forty
Ordinal
1540th
Roman numeral
MDXL
Binary
11000000100
Octal
3004
Hexadecimal
604

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1540, here are decompositions:

  • 17 + 1523 = 1540
  • 29 + 1511 = 1540
  • 41 + 1499 = 1540
  • 47 + 1493 = 1540
  • 53 + 1487 = 1540
  • 59 + 1481 = 1540
  • 89 + 1451 = 1540
  • 101 + 1439 = 1540

Showing the first eight; more decompositions exist.

Unicode codepoint
؄
U+0604
Format character (Cf)

UTF-8 encoding: D8 84 (2 bytes).

Lookup U+0604 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000604
RGB(0, 6, 4)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.4.