129,440
129,440 is a composite number, even.
129,440 (one hundred twenty-nine thousand four hundred forty) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2⁵ × 5 × 809. Its proper divisors sum to 176,740, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F9A0.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 44,921
- Recamán's sequence
- a(230,760) = 129,440
- Square (n²)
- 16,754,713,600
- Cube (n³)
- 2,168,730,128,384,000
- Divisor count
- 24
- σ(n) — sum of divisors
- 306,180
- φ(n) — Euler's totient
- 51,712
- Sum of prime factors
- 824
Primality
Prime factorization: 2 5 × 5 × 809
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√129,440 = [359; (1, 3, 2, 179, 2, 3, 1, 718)]
Period length 8 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-nine thousand four hundred forty
- Ordinal
- 129440th
- Binary
- 11111100110100000
- Octal
- 374640
- Hexadecimal
- 0x1F9A0
- Base64
- Afmg
- One's complement
- 4,294,837,855 (32-bit)
- Scientific notation
- 1.2944 × 10⁵
- As a duration
- 129,440 s = 1 day, 11 hours, 57 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρκθυμʹ
- Mayan (base 20)
- 𝋰·𝋣·𝋬·𝋠
- Chinese
- 一十二萬九千四百四十
- Chinese (financial)
- 壹拾貳萬玖仟肆佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 129440, here are decompositions:
- 37 + 129403 = 129440
- 61 + 129379 = 129440
- 79 + 129361 = 129440
- 127 + 129313 = 129440
- 151 + 129289 = 129440
- 163 + 129277 = 129440
- 211 + 129229 = 129440
- 271 + 129169 = 129440
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 9F A6 A0 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.1.249.160.
- Address
- 0.1.249.160
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.249.160
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 129,440 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.