138,724
138,724 is a composite number, even.
138,724 (one hundred thirty-eight thousand seven hundred twenty-four) is an even 6-digit number. It is a composite number with 12 divisors, and factors as 2² × 79 × 439. Written other ways, in hexadecimal, 0x21DE4.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 25
- Digit product
- 1,344
- Digital root
- 7
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 427,831
- Recamán's sequence
- a(491,379) = 138,724
- Square (n²)
- 19,244,348,176
- Cube (n³)
- 2,669,652,956,367,424
- Divisor count
- 12
- σ(n) — sum of divisors
- 246,400
- φ(n) — Euler's totient
- 68,328
- Sum of prime factors
- 522
Primality
Prime factorization: 2 2 × 79 × 439
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,724 = [372; (2, 5, 3, 1, 1, 1, 3, 4, 7, 1, 1, 9, 3, 1, 2, 1, 1, 22, 1, 2, 2, 1, 4, 1, …)]
Representations
- In words
- one hundred thirty-eight thousand seven hundred twenty-four
- Ordinal
- 138724th
- Binary
- 100001110111100100
- Octal
- 416744
- Hexadecimal
- 0x21DE4
- Base64
- Ah3k
- One's complement
- 4,294,828,571 (32-bit)
- Scientific notation
- 1.38724 × 10⁵
- As a duration
- 138,724 s = 1 day, 14 hours, 32 minutes, 4 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληψκδʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋰·𝋤
- Chinese
- 一十三萬八千七百二十四
- Chinese (financial)
- 壹拾參萬捌仟柒佰貳拾肆
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138724, here are decompositions:
- 41 + 138683 = 138724
- 83 + 138641 = 138724
- 107 + 138617 = 138724
- 137 + 138587 = 138724
- 227 + 138497 = 138724
- 263 + 138461 = 138724
- 317 + 138407 = 138724
- 353 + 138371 = 138724
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B7 A4 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.228.
- Address
- 0.2.29.228
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.228
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 138,724 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.