12,729
12,729 is a composite number, odd.
12,729 (twelve thousand seven hundred twenty-nine) is an odd 5-digit number. It is a composite number with 4 divisors, and factors as 3 × 4,243. Written other ways, in hexadecimal, 0x31B9.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 21
- Digit product
- 252
- Digital root
- 3
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 92,721
- Recamán's sequence
- a(48,817) = 12,729
- Square (n²)
- 162,027,441
- Cube (n³)
- 2,062,447,296,489
- Divisor count
- 4
- σ(n) — sum of divisors
- 16,976
- φ(n) — Euler's totient
- 8,484
- Sum of prime factors
- 4,246
Primality
Prime factorization: 3 × 4243
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√12,729 = [112; (1, 4, 1, 1, 1, 4, 1, 1, 1, 1, 74, 1, 1, 1, 1, 4, 1, 1, 1, 4, 1, 224)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- twelve thousand seven hundred twenty-nine
- Ordinal
- 12729th
- Binary
- 11000110111001
- Octal
- 30671
- Hexadecimal
- 0x31B9
- Base64
- Mbk=
- One's complement
- 52,806 (16-bit)
- Scientific notation
- 1.2729 × 10⁴
- As a duration
- 12,729 s = 3 hours, 32 minutes, 9 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ιβψκθʹ
- Mayan (base 20)
- 𝋡·𝋫·𝋰·𝋩
- Chinese
- 一萬二千七百二十九
- Chinese (financial)
- 壹萬貳仟柒佰貳拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 12,729 = 9
- e — Euler's number (e)
- Digit 12,729 = 1
- φ — Golden ratio (φ)
- Digit 12,729 = 7
- √2 — Pythagoras's (√2)
- Digit 12,729 = 2
- ln 2 — Natural log of 2
- Digit 12,729 = 6
- γ — Euler-Mascheroni (γ)
- Digit 12,729 = 9
Also seen as
UTF-8 encoding: E3 86 B9 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.49.185.
- Address
- 0.0.49.185
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.49.185
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 12,729 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G9 (12543.9 Hz, +25¢)
- Scientific pitch (C4 = 256 Hz): G♯9 (13004 Hz, -37¢)
- Baroque pitch (A4 = 415 Hz): G♯9 (12534.7 Hz, +27¢)
The digit sequence 12729 first appears in π at position 149,973 of the decimal expansion (the 149,973ordinal-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°.