138,788
138,788 is a composite number, even.
138,788 (one hundred thirty-eight thousand seven hundred eighty-eight) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2² × 13 × 17 × 157. Its proper divisors sum to 139,924, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21E24.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 35
- Digit product
- 10,752
- Digital root
- 8
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 887,831
- Recamán's sequence
- a(491,251) = 138,788
- Square (n²)
- 19,262,108,944
- Cube (n³)
- 2,673,349,576,119,872
- Divisor count
- 24
- σ(n) — sum of divisors
- 278,712
- φ(n) — Euler's totient
- 59,904
- Sum of prime factors
- 191
Primality
Prime factorization: 2 2 × 13 × 17 × 157
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,788 = [372; (1, 1, 5, 2, 1, 2, 1, 2, 5, 1, 1, 744)]
Period length 12 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand seven hundred eighty-eight
- Ordinal
- 138788th
- Binary
- 100001111000100100
- Octal
- 417044
- Hexadecimal
- 0x21E24
- Base64
- Ah4k
- One's complement
- 4,294,828,507 (32-bit)
- Scientific notation
- 1.38788 × 10⁵
- As a duration
- 138,788 s = 1 day, 14 hours, 33 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληψπηʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋳·𝋨
- Chinese
- 一十三萬八千七百八十八
- Chinese (financial)
- 壹拾參萬捌仟柒佰捌拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138788, here are decompositions:
- 61 + 138727 = 138788
- 109 + 138679 = 138788
- 127 + 138661 = 138788
- 151 + 138637 = 138788
- 211 + 138577 = 138788
- 229 + 138559 = 138788
- 241 + 138547 = 138788
- 271 + 138517 = 138788
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B8 A4 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.36.
- Address
- 0.2.30.36
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.36
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 138,788 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 138788 first appears in π at position 971,823 of the decimal expansion (the 971,823ordinal-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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.