138,515
138,515 is a composite number, odd.
138,515 (one hundred thirty-eight thousand five hundred fifteen) is an odd 6-digit number. It is a composite number with 8 divisors, and factors as 5 × 13 × 2,131. Written other ways, in hexadecimal, 0x21D13.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 600
- Digital root
- 5
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 515,831
- Recamán's sequence
- a(491,797) = 138,515
- Square (n²)
- 19,186,405,225
- Cube (n³)
- 2,657,604,919,740,875
- Divisor count
- 8
- σ(n) — sum of divisors
- 179,088
- φ(n) — Euler's totient
- 102,240
- Sum of prime factors
- 2,149
Primality
Prime factorization: 5 × 13 × 2131
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,515 = [372; (5, 1, 2, 7, 1, 1, 3, 3, 3, 1, 1, 2, 4, 1, 27, 1, 4, 2, 1, 1, 3, 3, 3, 1, …)]
Period length 30 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand five hundred fifteen
- Ordinal
- 138515th
- Binary
- 100001110100010011
- Octal
- 416423
- Hexadecimal
- 0x21D13
- Base64
- Ah0T
- One's complement
- 4,294,828,780 (32-bit)
- Scientific notation
- 1.38515 × 10⁵
- As a duration
- 138,515 s = 1 day, 14 hours, 28 minutes, 35 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληφιεʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋥·𝋯
- Chinese
- 一十三萬八千五百一十五
- Chinese (financial)
- 壹拾參萬捌仟伍佰壹拾伍
Also seen as
UTF-8 encoding: F0 A1 B4 93 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.19.
- Address
- 0.2.29.19
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.19
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 138,515 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 138515 first appears in π at position 349,655 of the decimal expansion (the 349,655ordinal-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.