138,908
138,908 is a composite number, even.
138,908 (one hundred thirty-eight thousand nine hundred eight) is an even 6-digit number. It is a composite number with 36 divisors, and factors as 2² × 7 × 11² × 41. Its proper divisors sum to 173,908, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21E9C.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 809,831
- Recamán's sequence
- a(491,011) = 138,908
- Square (n²)
- 19,295,432,464
- Cube (n³)
- 2,680,289,932,709,312
- Divisor count
- 36
- σ(n) — sum of divisors
- 312,816
- φ(n) — Euler's totient
- 52,800
- Sum of prime factors
- 74
Primality
Prime factorization: 2 2 × 7 × 11 2 × 41
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,908 = [372; (1, 2, 2, 1, 2, 19, 1, 3, 2, 5, 1, 2, 1, 1, 8, 2, 2, 6, 5, 4, 1, 5, 2, 1, …)]
Period length 52 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand nine hundred eight
- Ordinal
- 138908th
- Binary
- 100001111010011100
- Octal
- 417234
- Hexadecimal
- 0x21E9C
- Base64
- Ah6c
- One's complement
- 4,294,828,387 (32-bit)
- Scientific notation
- 1.38908 × 10⁵
- As a duration
- 138,908 s = 1 day, 14 hours, 35 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληϡηʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋥·𝋨
- Chinese
- 一十三萬八千九百零八
- Chinese (financial)
- 壹拾參萬捌仟玖佰零捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138908, here are decompositions:
- 19 + 138889 = 138908
- 67 + 138841 = 138908
- 79 + 138829 = 138908
- 109 + 138799 = 138908
- 181 + 138727 = 138908
- 229 + 138679 = 138908
- 271 + 138637 = 138908
- 331 + 138577 = 138908
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 BA 9C (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.156.
- Address
- 0.2.30.156
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.156
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 138,908 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 138908 first appears in π at position 1,967 of the decimal expansion (the 1,967ordinal-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.