13,805
13,805 is a composite number, odd.
13,805 (thirteen thousand eight hundred five) is an odd 5-digit number. It is a composite number with 8 divisors, and factors as 5 × 11 × 251. Written other ways, in hexadecimal, 0x35ED.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 17
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 50,831
- Recamán's sequence
- a(21,106) = 13,805
- Square (n²)
- 190,578,025
- Cube (n³)
- 2,630,929,635,125
- Divisor count
- 8
- σ(n) — sum of divisors
- 18,144
- φ(n) — Euler's totient
- 10,000
- Sum of prime factors
- 267
Primality
Prime factorization: 5 × 11 × 251
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√13,805 = [117; (2, 46, 2, 234)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- thirteen thousand eight hundred five
- Ordinal
- 13805th
- Binary
- 11010111101101
- Octal
- 32755
- Hexadecimal
- 0x35ED
- Base64
- Ne0=
- One's complement
- 51,730 (16-bit)
- Scientific notation
- 1.3805 × 10⁴
- As a duration
- 13,805 s = 3 hours, 50 minutes, 5 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ιγωεʹ
- Mayan (base 20)
- 𝋡·𝋮·𝋪·𝋥
- Chinese
- 一萬三千八百零五
- Chinese (financial)
- 壹萬參仟捌佰零伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 13,805 = 4
- e — Euler's number (e)
- Digit 13,805 = 5
- φ — Golden ratio (φ)
- Digit 13,805 = 0
- √2 — Pythagoras's (√2)
- Digit 13,805 = 3
- ln 2 — Natural log of 2
- Digit 13,805 = 7
- γ — Euler-Mascheroni (γ)
- Digit 13,805 = 0
Also seen as
UTF-8 encoding: E3 97 AD (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.53.237.
- Address
- 0.0.53.237
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.53.237
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 13,805 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A9 (14080 Hz, -34¢)
- Scientific pitch (C4 = 256 Hz): A9 (13777.2 Hz, +3¢)
- Baroque pitch (A4 = 415 Hz): A♯9 (14069.7 Hz, -33¢)
The digit sequence 13805 first appears in π at position 56,816 of the decimal expansion (the 56,816ordinal-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.