Number
1,428
1,428 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 15
- Digital root
- 6
- Palindrome
- No
- Divisor count
- 24
- σ(n) — sum of divisors
- 4,032
Primality
Prime factorization: 2 2 × 3 × 7 × 17
Divisors & multiples
All divisors (24)
Aliquot sum (sum of proper divisors):
2,604
Factor pairs (a × b = 1,428)
First multiples
Representations
- In words
- one thousand four hundred twenty-eight
- Ordinal
- 1428th
- Roman numeral
- MCDXXVIII
- Binary
- 10110010100
- Octal
- 2624
- Hexadecimal
- 594
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1428, here are decompositions:
- 5 + 1423 = 1428
- 19 + 1409 = 1428
- 29 + 1399 = 1428
- 47 + 1381 = 1428
- 61 + 1367 = 1428
- 67 + 1361 = 1428
- 101 + 1327 = 1428
- 107 + 1321 = 1428
Showing the first eight; more decompositions exist.
Unicode codepoint
֔
U+0594
Non-spacing mark (Mn)
UTF-8 encoding: D6 94 (2 bytes).
Hex color
#000594
RGB(0, 5, 148)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.148.