129,428
129,428 is a composite number, even.
129,428 (one hundred twenty-nine thousand four hundred twenty-eight) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2² × 13 × 19 × 131. Written other ways, in hexadecimal, 0x1F994.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 26
- Digit product
- 1,152
- Digital root
- 8
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 824,921
- Recamán's sequence
- a(230,784) = 129,428
- Square (n²)
- 16,751,607,184
- Cube (n³)
- 2,168,127,014,610,752
- Divisor count
- 24
- σ(n) — sum of divisors
- 258,720
- φ(n) — Euler's totient
- 56,160
- Sum of prime factors
- 167
Primality
Prime factorization: 2 2 × 13 × 19 × 131
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√129,428 = [359; (1, 3, 5, 2, 2, 2, 5, 3, 1, 718)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-nine thousand four hundred twenty-eight
- Ordinal
- 129428th
- Binary
- 11111100110010100
- Octal
- 374624
- Hexadecimal
- 0x1F994
- Base64
- AfmU
- One's complement
- 4,294,837,867 (32-bit)
- Scientific notation
- 1.29428 × 10⁵
- As a duration
- 129,428 s = 1 day, 11 hours, 57 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρκθυκηʹ
- Mayan (base 20)
- 𝋰·𝋣·𝋫·𝋨
- Chinese
- 一十二萬九千四百二十八
- Chinese (financial)
- 壹拾貳萬玖仟肆佰貳拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 129428, here are decompositions:
- 67 + 129361 = 129428
- 139 + 129289 = 129428
- 151 + 129277 = 129428
- 199 + 129229 = 129428
- 241 + 129187 = 129428
- 307 + 129121 = 129428
- 331 + 129097 = 129428
- 367 + 129061 = 129428
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 9F A6 94 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.1.249.148.
- Address
- 0.1.249.148
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.249.148
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 129,428 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.