8,138
8,138 is a composite number, even.
8,138 (eight thousand one hundred thirty-eight) is an even 4-digit number. It is a composite number with 8 divisors, and factors as 2 × 13 × 313. Written other ways, in hexadecimal, 0x1FCA.
Interestingness
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 20
- Digit product
- 192
- Digital root
- 2
- Palindrome
- No
- Bit width
- 13 bits
- Reversed
- 8,318
- Recamán's sequence
- a(10,491) = 8,138
- Square (n²)
- 66,227,044
- Cube (n³)
- 538,955,684,072
- Divisor count
- 8
- σ(n) — sum of divisors
- 13,188
- φ(n) — Euler's totient
- 3,744
- Sum of prime factors
- 328
Primality
Prime factorization: 2 × 13 × 313
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√8,138 = [90; (4, 1, 2, 1, 7, 2, 6, 2, 7, 1, 2, 1, 4, 180)]
Period length 14 — the block in parentheses repeats forever.
Representations
- In words
- eight thousand one hundred thirty-eight
- Ordinal
- 8138th
- Binary
- 1111111001010
- Octal
- 17712
- Hexadecimal
- 0x1FCA
- Base64
- H8o=
- One's complement
- 57,397 (16-bit)
- Scientific notation
- 8.138 × 10³
- As a duration
- 8,138 s = 2 hours, 15 minutes, 38 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ηρληʹ
- Mayan (base 20)
- 𝋡·𝋠·𝋦·𝋲
- Chinese
- 八千一百三十八
- Chinese (financial)
- 捌仟壹佰參拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 8,138 = 5
- e — Euler's number (e)
- Digit 8,138 = 0
- φ — Golden ratio (φ)
- Digit 8,138 = 8
- √2 — Pythagoras's (√2)
- Digit 8,138 = 8
- ln 2 — Natural log of 2
- Digit 8,138 = 6
- γ — Euler-Mascheroni (γ)
- Digit 8,138 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 8138, here are decompositions:
- 37 + 8101 = 8138
- 79 + 8059 = 8138
- 127 + 8011 = 8138
- 211 + 7927 = 8138
- 271 + 7867 = 8138
- 349 + 7789 = 8138
- 379 + 7759 = 8138
- 397 + 7741 = 8138
Showing the first eight; more decompositions exist.
UTF-8 encoding: E1 BF 8A (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.31.202.
- Address
- 0.0.31.202
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.31.202
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 8,138 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C9 (8372 Hz, -49¢ — about midway to B8)
- Scientific pitch (C4 = 256 Hz): C9 (8192 Hz, -11¢)
- Baroque pitch (A4 = 415 Hz): C♯9 (8365.9 Hz, -48¢ — about midway to C9)
The digit sequence 8138 first appears in π at position 2,196 of the decimal expansion (the 2,196ordinal-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.