Number
1,380
1,380 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 12
- Digital root
- 3
- Palindrome
- No
- Divisor count
- 24
- σ(n) — sum of divisors
- 4,032
Primality
Prime factorization: 2 2 × 3 × 5 × 23
Divisors & multiples
All divisors (24)
Aliquot sum (sum of proper divisors):
2,652
Factor pairs (a × b = 1,380)
First multiples
Representations
- In words
- one thousand three hundred eighty
- Ordinal
- 1380th
- Roman numeral
- MCCCLXXX
- Binary
- 10101100100
- Octal
- 2544
- Hexadecimal
- 564
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1380, here are decompositions:
- 7 + 1373 = 1380
- 13 + 1367 = 1380
- 19 + 1361 = 1380
- 53 + 1327 = 1380
- 59 + 1321 = 1380
- 61 + 1319 = 1380
- 73 + 1307 = 1380
- 79 + 1301 = 1380
Showing the first eight; more decompositions exist.
Unicode codepoint
դ
U+0564
Lowercase letter (Ll)
UTF-8 encoding: D5 A4 (2 bytes).
Hex color
#000564
RGB(0, 5, 100)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.100.