139,721
139,721 is a prime, odd.
139,721 (one hundred thirty-nine thousand seven hundred twenty-one) is an odd 6-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x221C9.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 378
- Digital root
- 5
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 127,931
- Recamán's sequence
- a(489,385) = 139,721
- Square (n²)
- 19,521,957,841
- Cube (n³)
- 2,727,627,471,502,361
- Divisor count
- 2
- σ(n) — sum of divisors
- 139,722
- φ(n) — Euler's totient
- 139,720
Primality
139,721 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√139,721 = [373; (1, 3, 1, 4, 1, 2, 3, 3, 25, 2, 9, 1, 3, 106, 1, 1, 5, 2, 11, 23, 3, 1, 1, 1, …)]
Representations
- In words
- one hundred thirty-nine thousand seven hundred twenty-one
- Ordinal
- 139721st
- Binary
- 100010000111001001
- Octal
- 420711
- Hexadecimal
- 0x221C9
- Base64
- AiHJ
- One's complement
- 4,294,827,574 (32-bit)
- Scientific notation
- 1.39721 × 10⁵
- As a duration
- 139,721 s = 1 day, 14 hours, 48 minutes, 41 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλθψκαʹ
- Mayan (base 20)
- 𝋱·𝋩·𝋦·𝋡
- Chinese
- 一十三萬九千七百二十一
- Chinese (financial)
- 壹拾參萬玖仟柒佰貳拾壹
Also seen as
UTF-8 encoding: F0 A2 87 89 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.33.201.
- Address
- 0.2.33.201
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.33.201
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 139,721 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.