138,005
138,005 is a composite number, odd.
138,005 (one hundred thirty-eight thousand five) is an odd 6-digit number. It is a composite number with 8 divisors, and factors as 5 × 7 × 3,943. Written other ways, in hexadecimal, 0x21B15.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 17
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 500,831
- Recamán's sequence
- a(492,817) = 138,005
- Square (n²)
- 19,045,380,025
- Cube (n³)
- 2,628,357,670,350,125
- Divisor count
- 8
- σ(n) — sum of divisors
- 189,312
- φ(n) — Euler's totient
- 94,608
- Sum of prime factors
- 3,955
Primality
Prime factorization: 5 × 7 × 3943
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,005 = [371; (2, 25, 8, 3, 4, 4, 1, 3, 12, 3, 36, 1, 4, 1, 2, 3, 5, 1, 17, 3, 1, 1, 3, 6, …)]
Representations
- In words
- one hundred thirty-eight thousand five
- Ordinal
- 138005th
- Binary
- 100001101100010101
- Octal
- 415425
- Hexadecimal
- 0x21B15
- Base64
- AhsV
- One's complement
- 4,294,829,290 (32-bit)
- Scientific notation
- 1.38005 × 10⁵
- As a duration
- 138,005 s = 1 day, 14 hours, 20 minutes, 5 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋 𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληεʹ
- Mayan (base 20)
- 𝋱·𝋥·𝋠·𝋥
- Chinese
- 一十三萬八千零五
- Chinese (financial)
- 壹拾參萬捌仟零伍
Also seen as
UTF-8 encoding: F0 A1 AC 95 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.27.21.
- Address
- 0.2.27.21
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.27.21
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 138,005 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 138005 first appears in π at position 660,775 of the decimal expansion (the 660,775ordinal-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.