138,542
138,542 is a composite number, even.
138,542 (one hundred thirty-eight thousand five hundred forty-two) is an even 6-digit number. It is a composite number with 8 divisors, and factors as 2 × 53 × 1,307. Written other ways, in hexadecimal, 0x21D2E.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 960
- Digital root
- 5
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 245,831
- Recamán's sequence
- a(491,743) = 138,542
- Square (n²)
- 19,193,885,764
- Cube (n³)
- 2,659,159,321,516,088
- Divisor count
- 8
- σ(n) — sum of divisors
- 211,896
- φ(n) — Euler's totient
- 67,912
- Sum of prime factors
- 1,362
Primality
Prime factorization: 2 × 53 × 1307
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,542 = [372; (4, 1, 2, 2, 4, 1, 1, 2, 1, 43, 14, 43, 1, 2, 1, 1, 4, 2, 2, 1, 4, 744)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand five hundred forty-two
- Ordinal
- 138542nd
- Binary
- 100001110100101110
- Octal
- 416456
- Hexadecimal
- 0x21D2E
- Base64
- Ah0u
- One's complement
- 4,294,828,753 (32-bit)
- Scientific notation
- 1.38542 × 10⁵
- As a duration
- 138,542 s = 1 day, 14 hours, 29 minutes, 2 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ρληφμβʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋧·𝋢
- Chinese
- 一十三萬八千五百四十二
- Chinese (financial)
- 壹拾參萬捌仟伍佰肆拾貳
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138542, here are decompositions:
- 31 + 138511 = 138542
- 73 + 138469 = 138542
- 109 + 138433 = 138542
- 139 + 138403 = 138542
- 193 + 138349 = 138542
- 223 + 138319 = 138542
- 379 + 138163 = 138542
- 463 + 138079 = 138542
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B4 AE (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.46.
- Address
- 0.2.29.46
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.46
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 138,542 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.