Number
1,388
1,388 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 20
- Digital root
- 2
- Palindrome
- No
- Divisor count
- 6
- σ(n) — sum of divisors
- 2,436
Primality
Prime factorization: 2 2 × 347
Divisors & multiples
Aliquot sum (sum of proper divisors):
1,048
First multiples
Representations
- In words
- one thousand three hundred eighty-eight
- Ordinal
- 1388th
- Roman numeral
- MCCCLXXXVIII
- Binary
- 10101101100
- Octal
- 2554
- Hexadecimal
- 56C
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1388, here are decompositions:
- 7 + 1381 = 1388
- 61 + 1327 = 1388
- 67 + 1321 = 1388
- 97 + 1291 = 1388
- 109 + 1279 = 1388
- 139 + 1249 = 1388
- 151 + 1237 = 1388
- 157 + 1231 = 1388
Showing the first eight; more decompositions exist.
Unicode codepoint
լ
U+056C
Lowercase letter (Ll)
UTF-8 encoding: D5 AC (2 bytes).
Hex color
#00056C
RGB(0, 5, 108)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.108.