138,105
138,105 is a composite number, odd.
138,105 (one hundred thirty-eight thousand one hundred five) is an odd 6-digit number. It is a composite number with 40 divisors, and factors as 3⁴ × 5 × 11 × 31. Its proper divisors sum to 140,679, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21B79.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 18
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 501,831
- Recamán's sequence
- a(492,617) = 138,105
- Square (n²)
- 19,072,991,025
- Cube (n³)
- 2,634,075,425,507,625
- Divisor count
- 40
- σ(n) — sum of divisors
- 278,784
- φ(n) — Euler's totient
- 64,800
- Sum of prime factors
- 59
Primality
Prime factorization: 3 4 × 5 × 11 × 31
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,105 = [371; (1, 1, 1, 1, 1, 81, 1, 22, 1, 81, 1, 1, 1, 1, 1, 742)]
Period length 16 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand one hundred five
- Ordinal
- 138105th
- Binary
- 100001101101111001
- Octal
- 415571
- Hexadecimal
- 0x21B79
- Base64
- Aht5
- One's complement
- 4,294,829,190 (32-bit)
- Scientific notation
- 1.38105 × 10⁵
- As a duration
- 138,105 s = 1 day, 14 hours, 21 minutes, 45 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληρεʹ
- Mayan (base 20)
- 𝋱·𝋥·𝋥·𝋥
- Chinese
- 一十三萬八千一百零五
- Chinese (financial)
- 壹拾參萬捌仟壹佰零伍
Also seen as
UTF-8 encoding: F0 A1 AD B9 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.27.121.
- Address
- 0.2.27.121
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.27.121
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 138,105 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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.