129,042
129,042 is a composite number, even.
129,042 (one hundred twenty-nine thousand forty-two) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2 × 3² × 67 × 107. Its proper divisors sum to 157,374, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F812.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 18
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 240,921
- Recamán's sequence
- a(231,556) = 129,042
- Square (n²)
- 16,651,837,764
- Cube (n³)
- 2,148,786,448,742,088
- Divisor count
- 24
- σ(n) — sum of divisors
- 286,416
- φ(n) — Euler's totient
- 41,976
- Sum of prime factors
- 182
Primality
Prime factorization: 2 × 3 2 × 67 × 107
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√129,042 = [359; (4, 2, 5, 1, 10, 1, 1, 3, 1, 2, 1, 2, 4, 14, 2, 3, 4, 5, 1, 2, 2, 1, 1, 1, …)]
Representations
- In words
- one hundred twenty-nine thousand forty-two
- Ordinal
- 129042nd
- Binary
- 11111100000010010
- Octal
- 374022
- Hexadecimal
- 0x1F812
- Base64
- AfgS
- One's complement
- 4,294,838,253 (32-bit)
- Scientific notation
- 1.29042 × 10⁵
- As a duration
- 129,042 s = 1 day, 11 hours, 50 minutes, 42 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ρκθμβʹ
- Mayan (base 20)
- 𝋰·𝋢·𝋬·𝋢
- Chinese
- 一十二萬九千零四十二
- Chinese (financial)
- 壹拾貳萬玖仟零肆拾貳
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 129042, here are decompositions:
- 5 + 129037 = 129042
- 19 + 129023 = 129042
- 31 + 129011 = 129042
- 41 + 129001 = 129042
- 59 + 128983 = 129042
- 61 + 128981 = 129042
- 71 + 128971 = 129042
- 73 + 128969 = 129042
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 9F A0 92 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.1.248.18.
- Address
- 0.1.248.18
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.248.18
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 129,042 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°.