138,872
138,872 is a composite number, even.
138,872 (one hundred thirty-eight thousand eight hundred seventy-two) is an even 6-digit number. It is a composite number with 8 divisors, and factors as 2³ × 17,359. Written other ways, in hexadecimal, 0x21E78.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 2,688
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 278,831
- Recamán's sequence
- a(491,083) = 138,872
- Square (n²)
- 19,285,432,384
- Cube (n³)
- 2,678,206,566,030,848
- Divisor count
- 8
- σ(n) — sum of divisors
- 260,400
- φ(n) — Euler's totient
- 69,432
- Sum of prime factors
- 17,365
Primality
Prime factorization: 2 3 × 17359
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,872 = [372; (1, 1, 1, 9, 7, 7, 1, 1, 5, 2, 1, 43, 6, 2, 2, 17, 1, 3, 2, 1, 1, 2, 1, 1, …)]
Representations
- In words
- one hundred thirty-eight thousand eight hundred seventy-two
- Ordinal
- 138872nd
- Binary
- 100001111001111000
- Octal
- 417170
- Hexadecimal
- 0x21E78
- Base64
- Ah54
- One's complement
- 4,294,828,423 (32-bit)
- Scientific notation
- 1.38872 × 10⁵
- As a duration
- 138,872 s = 1 day, 14 hours, 34 minutes, 32 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ρληωοβʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋣·𝋬
- Chinese
- 一十三萬八千八百七十二
- Chinese (financial)
- 壹拾參萬捌仟捌佰柒拾貳
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138872, here are decompositions:
- 3 + 138869 = 138872
- 31 + 138841 = 138872
- 43 + 138829 = 138872
- 73 + 138799 = 138872
- 79 + 138793 = 138872
- 109 + 138763 = 138872
- 193 + 138679 = 138872
- 211 + 138661 = 138872
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B9 B8 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.120.
- Address
- 0.2.30.120
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.120
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 138,872 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 138872 first appears in π at position 412,128 of the decimal expansion (the 412,128ordinal-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.