Number

1,890

1,890 is a composite number, even, a calendar year.

Abundant Number Harshad / Niven Year

Properties

Parity: Even
Digit count: 4
Digit sum: 18
Digital root: 9
Palindrome: No
Divisor count: 32
σ(n) — sum of divisors: 5,760

Primality

Prime factorization: 2 × 3 ³ × 5 × 7

Divisors & multiples

All divisors (32)

1 · 2 · 3 · 5 · 6 · 7 · 9 · 10 · 14 · 15 · 18 · 21 · 27 · 30 · 35 · 42 · 45 · 54 · 63 · 70 · 90 · 105 · 126 · 135 · 189 · 210 · 270 · 315 · 378 · 630 · 945 · 1890

Aliquot sum (sum of proper divisors): 3,870

Factor pairs (a × b = 1,890)

1 × 1890

2 × 945

3 × 630

5 × 378

6 × 315

7 × 270

9 × 210

10 × 189

14 × 135

15 × 126

18 × 105

21 × 90

27 × 70

30 × 63

35 × 54

42 × 45

First multiples

1,890 · 3,780 · 5,670 · 7,560 · 9,450 · 11,340 · 13,230 · 15,120 · 17,010 · 18,900

Representations

In words: one thousand eight hundred ninety
Ordinal: 1890th
Roman numeral: MDCCCXC
Binary: 11101100010
Octal: 3542
Hexadecimal: 762

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1890, here are decompositions:

11 + 1879 = 1890
13 + 1877 = 1890
17 + 1873 = 1890
19 + 1871 = 1890
23 + 1867 = 1890
29 + 1861 = 1890
43 + 1847 = 1890
59 + 1831 = 1890

Showing the first eight; more decompositions exist.

Unicode codepoint

U+0762

Other letter (Lo)

UTF-8 encoding: DD A2 (2 bytes).

Lookup U+0762 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000762

RGB(0, 7, 98)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.98.