Number

1,440

1,440 is a composite number, even, a calendar year.

Abundant Number Harshad / Niven Year

Properties

Parity: Even
Digit count: 4
Digit sum: 9
Digital root: 9
Palindrome: No
Divisor count: 36
σ(n) — sum of divisors: 4,914

Primality

Prime factorization: 2 ⁵ × 3 ² × 5

Divisors & multiples

All divisors (36)

1 · 2 · 3 · 4 · 5 · 6 · 8 · 9 · 10 · 12 · 15 · 16 · 18 · 20 · 24 · 30 · 32 · 36 · 40 · 45 · 48 · 60 · 72 · 80 · 90 · 96 · 120 · 144 · 160 · 180 · 240 · 288 · 360 · 480 · 720 · 1440

Aliquot sum (sum of proper divisors): 3,474

Factor pairs (a × b = 1,440)

1 × 1440

2 × 720

3 × 480

4 × 360

5 × 288

6 × 240

8 × 180

9 × 160

10 × 144

12 × 120

15 × 96

16 × 90

18 × 80

20 × 72

24 × 60

30 × 48

32 × 45

36 × 40

First multiples

1,440 · 2,880 · 4,320 · 5,760 · 7,200 · 8,640 · 10,080 · 11,520 · 12,960 · 14,400

Representations

In words: one thousand four hundred forty
Ordinal: 1440th
Roman numeral: MCDXL
Binary: 10110100000
Octal: 2640
Hexadecimal: 5A0

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1440, here are decompositions:

7 + 1433 = 1440
11 + 1429 = 1440
13 + 1427 = 1440
17 + 1423 = 1440
31 + 1409 = 1440
41 + 1399 = 1440
59 + 1381 = 1440
67 + 1373 = 1440

Showing the first eight; more decompositions exist.

Unicode codepoint

U+05A0

Non-spacing mark (Mn)

UTF-8 encoding: D6 A0 (2 bytes).

Lookup U+05A0 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0005A0

RGB(0, 5, 160)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.160.