13,808
13,808 is a composite number, even.
13,808 (thirteen thousand eight hundred eight) is an even 5-digit number. It is a composite number with 10 divisors, and factors as 2⁴ × 863. Written other ways, in hexadecimal, 0x35F0.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 80,831
- Recamán's sequence
- a(21,100) = 13,808
- Square (n²)
- 190,660,864
- Cube (n³)
- 2,632,645,210,112
- Divisor count
- 10
- σ(n) — sum of divisors
- 26,784
- φ(n) — Euler's totient
- 6,896
- Sum of prime factors
- 871
Primality
Prime factorization: 2 4 × 863
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√13,808 = [117; (1, 1, 33, 13, 1, 3, 1, 6, 1, 1, 4, 1, 4, 5, 1, 1, 9, 1, 2, 14, 2, 1, 9, 1, …)]
Period length 40 — the block in parentheses repeats forever.
Representations
- In words
- thirteen thousand eight hundred eight
- Ordinal
- 13808th
- Binary
- 11010111110000
- Octal
- 32760
- Hexadecimal
- 0x35F0
- Base64
- NfA=
- One's complement
- 51,727 (16-bit)
- Scientific notation
- 1.3808 × 10⁴
- As a duration
- 13,808 s = 3 hours, 50 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ιγωηʹ
- Mayan (base 20)
- 𝋡·𝋮·𝋪·𝋨
- Chinese
- 一萬三千八百零八
- Chinese (financial)
- 壹萬參仟捌佰零捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 13,808 = 1
- e — Euler's number (e)
- Digit 13,808 = 0
- φ — Golden ratio (φ)
- Digit 13,808 = 3
- √2 — Pythagoras's (√2)
- Digit 13,808 = 1
- ln 2 — Natural log of 2
- Digit 13,808 = 7
- γ — Euler-Mascheroni (γ)
- Digit 13,808 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 13808, here are decompositions:
- 19 + 13789 = 13808
- 79 + 13729 = 13808
- 97 + 13711 = 13808
- 127 + 13681 = 13808
- 139 + 13669 = 13808
- 181 + 13627 = 13808
- 211 + 13597 = 13808
- 241 + 13567 = 13808
Showing the first eight; more decompositions exist.
UTF-8 encoding: E3 97 B0 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.53.240.
- Address
- 0.0.53.240
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.53.240
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 13,808 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A9 (14080 Hz, -34¢)
- Scientific pitch (C4 = 256 Hz): A9 (13777.2 Hz, +4¢)
- Baroque pitch (A4 = 415 Hz): A♯9 (14069.7 Hz, -33¢)
The digit sequence 13808 first appears in π at position 11,977 of the decimal expansion (the 11,977ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.