138,721
138,721 is a composite number, odd.
138,721 (one hundred thirty-eight thousand seven hundred twenty-one) is an odd 6-digit number. It is a composite number with 4 divisors, and factors as 11 × 12,611. Written other ways, in hexadecimal, 0x21DE1.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 22
- Digit product
- 336
- Digital root
- 4
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 127,831
- Recamán's sequence
- a(491,385) = 138,721
- Square (n²)
- 19,243,515,841
- Cube (n³)
- 2,669,479,760,979,361
- Divisor count
- 4
- σ(n) — sum of divisors
- 151,344
- φ(n) — Euler's totient
- 126,100
- Sum of prime factors
- 12,622
Primality
Prime factorization: 11 × 12611
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,721 = [372; (2, 4, 1, 3, 1, 1, 1, 1, 1, 1, 13, 1, 92, 5, 1, 1, 34, 1, 12, 1, 1, 2, 1, 45, …)]
Representations
- In words
- one hundred thirty-eight thousand seven hundred twenty-one
- Ordinal
- 138721st
- Binary
- 100001110111100001
- Octal
- 416741
- Hexadecimal
- 0x21DE1
- Base64
- Ah3h
- One's complement
- 4,294,828,574 (32-bit)
- Scientific notation
- 1.38721 × 10⁵
- As a duration
- 138,721 s = 1 day, 14 hours, 32 minutes, 1 second
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρληψκαʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋰·𝋡
- Chinese
- 一十三萬八千七百二十一
- Chinese (financial)
- 壹拾參萬捌仟柒佰貳拾壹
Also seen as
UTF-8 encoding: F0 A1 B7 A1 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.225.
- Address
- 0.2.29.225
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.225
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 138,721 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 138721 first appears in π at position 895,117 of the decimal expansion (the 895,117ordinal-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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.