13,665
13,665 is a composite number, odd.
13,665 (thirteen thousand six hundred sixty-five) is an odd 5-digit number. It is a composite number with 8 divisors, and factors as 3 × 5 × 911. Written other ways, in hexadecimal, 0x3561.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 21
- Digit product
- 540
- Digital root
- 3
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 56,631
- Recamán's sequence
- a(4,102) = 13,665
- Square (n²)
- 186,732,225
- Cube (n³)
- 2,551,695,854,625
- Divisor count
- 8
- σ(n) — sum of divisors
- 21,888
- φ(n) — Euler's totient
- 7,280
- Sum of prime factors
- 919
Primality
Prime factorization: 3 × 5 × 911
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√13,665 = [116; (1, 8, 1, 2, 1, 13, 1, 6, 1, 1, 1, 1, 3, 1, 1, 3, 10, 1, 5, 1, 3, 3, 7, 1, …)]
Representations
- In words
- thirteen thousand six hundred sixty-five
- Ordinal
- 13665th
- Binary
- 11010101100001
- Octal
- 32541
- Hexadecimal
- 0x3561
- Base64
- NWE=
- One's complement
- 51,870 (16-bit)
- Scientific notation
- 1.3665 × 10⁴
- As a duration
- 13,665 s = 3 hours, 47 minutes, 45 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ιγχξεʹ
- Mayan (base 20)
- 𝋡·𝋮·𝋣·𝋥
- Chinese
- 一萬三千六百六十五
- Chinese (financial)
- 壹萬參仟陸佰陸拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 13,665 = 2
- e — Euler's number (e)
- Digit 13,665 = 2
- φ — Golden ratio (φ)
- Digit 13,665 = 3
- √2 — Pythagoras's (√2)
- Digit 13,665 = 5
- ln 2 — Natural log of 2
- Digit 13,665 = 8
- γ — Euler-Mascheroni (γ)
- Digit 13,665 = 3
Also seen as
UTF-8 encoding: E3 95 A1 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.53.97.
- Address
- 0.0.53.97
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.53.97
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 13,665 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯9 (13289.8 Hz, +48¢ — about midway to A9)
- Scientific pitch (C4 = 256 Hz): A9 (13777.2 Hz, -14¢)
- Baroque pitch (A4 = 415 Hz): A9 (13280 Hz, +49¢ — about midway to A♯9)
The digit sequence 13665 first appears in π at position 223,563 of the decimal expansion (the 223,563ordinal-suffix:rd 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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.