138,642
138,642 is a composite number, even.
138,642 (one hundred thirty-eight thousand six hundred forty-two) is an even 6-digit number. It is a composite number with 16 divisors, and factors as 2 × 3 × 7 × 3,301. Its proper divisors sum to 178,350, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21D92.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 24
- Digit product
- 1,152
- Digital root
- 6
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 246,831
- Recamán's sequence
- a(491,543) = 138,642
- Square (n²)
- 19,221,604,164
- Cube (n³)
- 2,664,921,644,505,288
- Divisor count
- 16
- σ(n) — sum of divisors
- 316,992
- φ(n) — Euler's totient
- 39,600
- Sum of prime factors
- 3,313
Primality
Prime factorization: 2 × 3 × 7 × 3301
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,642 = [372; (2, 1, 7, 1, 2, 2, 1, 18, 2, 1, 1, 5, 1, 1, 3, 1, 11, 4, 3, 9, 8, 2, 4, 1, …)]
Representations
- In words
- one hundred thirty-eight thousand six hundred forty-two
- Ordinal
- 138642nd
- Binary
- 100001110110010010
- Octal
- 416622
- Hexadecimal
- 0x21D92
- Base64
- Ah2S
- One's complement
- 4,294,828,653 (32-bit)
- Scientific notation
- 1.38642 × 10⁵
- As a duration
- 138,642 s = 1 day, 14 hours, 30 minutes, 42 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋 𒌋𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ρληχμβʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋬·𝋢
- Chinese
- 一十三萬八千六百四十二
- Chinese (financial)
- 壹拾參萬捌仟陸佰肆拾貳
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138642, here are decompositions:
- 5 + 138637 = 138642
- 13 + 138629 = 138642
- 43 + 138599 = 138642
- 61 + 138581 = 138642
- 71 + 138571 = 138642
- 73 + 138569 = 138642
- 79 + 138563 = 138642
- 83 + 138559 = 138642
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B6 92 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.146.
- Address
- 0.2.29.146
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.146
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 138,642 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 138642 first appears in π at position 743,593 of the decimal expansion (the 743,593ordinal-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°.