Number

1,920

1,920 is a composite number, even, a calendar year.

Abundant Number Happy Number Harshad / Niven Year

Properties

Parity: Even
Digit count: 4
Digit sum: 12
Digital root: 3
Palindrome: No
Divisor count: 32
σ(n) — sum of divisors: 6,120

Primality

Prime factorization: 2 ⁷ × 3 × 5

Divisors & multiples

All divisors (32)

1 · 2 · 3 · 4 · 5 · 6 · 8 · 10 · 12 · 15 · 16 · 20 · 24 · 30 · 32 · 40 · 48 · 60 · 64 · 80 · 96 · 120 · 128 · 160 · 192 · 240 · 320 · 384 · 480 · 640 · 960 · 1920

Aliquot sum (sum of proper divisors): 4,200

Factor pairs (a × b = 1,920)

1 × 1920

2 × 960

3 × 640

4 × 480

5 × 384

6 × 320

8 × 240

10 × 192

12 × 160

15 × 128

16 × 120

20 × 96

24 × 80

30 × 64

32 × 60

40 × 48

First multiples

1,920 · 3,840 · 5,760 · 7,680 · 9,600 · 11,520 · 13,440 · 15,360 · 17,280 · 19,200

Representations

In words: one thousand nine hundred twenty
Ordinal: 1920th
Roman numeral: MCMXX
Binary: 11110000000
Octal: 3600
Hexadecimal: 780

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1920, here are decompositions:

7 + 1913 = 1920
13 + 1907 = 1920
19 + 1901 = 1920
31 + 1889 = 1920
41 + 1879 = 1920
43 + 1877 = 1920
47 + 1873 = 1920
53 + 1867 = 1920

Showing the first eight; more decompositions exist.

Unicode codepoint

U+0780

Other letter (Lo)

UTF-8 encoding: DE 80 (2 bytes).

Lookup U+0780 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000780

RGB(0, 7, 128)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.128.