138,831
138,831 is a composite number, odd.
138,831 (one hundred thirty-eight thousand eight hundred thirty-one) is an odd 6-digit number. It is a composite number with 16 divisors, and factors as 3 × 7 × 11 × 601. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in hexadecimal, 0x21E4F.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 24
- Digit product
- 576
- Digital root
- 6
- Palindrome
- Yes
- Bit width
- 18 bits
- Recamán's sequence
- a(491,165) = 138,831
- Square (n²)
- 19,274,046,561
- Cube (n³)
- 2,675,835,158,110,191
- Divisor count
- 16
- σ(n) — sum of divisors
- 231,168
- φ(n) — Euler's totient
- 72,000
- Sum of prime factors
- 622
Primality
Prime factorization: 3 × 7 × 11 × 601
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,831 = [372; (1, 1, 1, 1, 123, 1, 1, 1, 1, 744)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand eight hundred thirty-one
- Ordinal
- 138831st
- Binary
- 100001111001001111
- Octal
- 417117
- Hexadecimal
- 0x21E4F
- Base64
- Ah5P
- One's complement
- 4,294,828,464 (32-bit)
- Scientific notation
- 1.38831 × 10⁵
- As a duration
- 138,831 s = 1 day, 14 hours, 33 minutes, 51 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρληωλαʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋡·𝋫
- Chinese
- 一十三萬八千八百三十一
- Chinese (financial)
- 壹拾參萬捌仟捌佰參拾壹
Also seen as
UTF-8 encoding: F0 A1 B9 8F (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.79.
- Address
- 0.2.30.79
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.79
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 138,831 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 138831 first appears in π at position 55,057 of the decimal expansion (the 55,057ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.