7,997
7,997 is a composite number, odd.
7,997 (seven thousand nine hundred ninety-seven) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 11 × 727. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in hexadecimal, 0x1F3D.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 32
- Digit product
- 3,969
- Digital root
- 5
- Palindrome
- Yes
- Bit width
- 13 bits
- Recamán's sequence
- a(25,602) = 7,997
- Square (n²)
- 63,952,009
- Cube (n³)
- 511,424,215,973
- Divisor count
- 4
- σ(n) — sum of divisors
- 8,736
- φ(n) — Euler's totient
- 7,260
- Sum of prime factors
- 738
Primality
Prime factorization: 11 × 727
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√7,997 = [89; (2, 2, 1, 7, 16, 7, 1, 2, 2, 178)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- seven thousand nine hundred ninety-seven
- Ordinal
- 7997th
- Binary
- 1111100111101
- Octal
- 17475
- Hexadecimal
- 0x1F3D
- Base64
- Hz0=
- One's complement
- 57,538 (16-bit)
- Scientific notation
- 7.997 × 10³
- As a duration
- 7,997 s = 2 hours, 13 minutes, 17 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ζϡϟζʹ
- Mayan (base 20)
- 𝋳·𝋳·𝋱
- Chinese
- 七千九百九十七
- Chinese (financial)
- 柒仟玖佰玖拾柒
Digit at this position in famous constants
- π — Pi (π)
- Digit 7,997 = 3
- e — Euler's number (e)
- Digit 7,997 = 5
- φ — Golden ratio (φ)
- Digit 7,997 = 0
- √2 — Pythagoras's (√2)
- Digit 7,997 = 9
- ln 2 — Natural log of 2
- Digit 7,997 = 3
- γ — Euler-Mascheroni (γ)
- Digit 7,997 = 0
Also seen as
UTF-8 encoding: E1 BC BD (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.31.61.
- Address
- 0.0.31.61
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.31.61
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 7,997 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B8 (7902.1 Hz, +21¢)
- Scientific pitch (C4 = 256 Hz): C9 (8192 Hz, -42¢)
- Baroque pitch (A4 = 415 Hz): C9 (7896.3 Hz, +22¢)
The digit sequence 7997 first appears in π at position 14,235 of the decimal expansion (the 14,235ordinal-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.