129,420
129,420 is a composite number, even.
129,420 (one hundred twenty-nine thousand four hundred twenty) is an even 6-digit number. It is a composite number with 36 divisors, and factors as 2² × 3² × 5 × 719. Its proper divisors sum to 263,700, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F98C.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 18
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 24,921
- Recamán's sequence
- a(230,800) = 129,420
- Square (n²)
- 16,749,536,400
- Cube (n³)
- 2,167,725,000,888,000
- Divisor count
- 36
- σ(n) — sum of divisors
- 393,120
- φ(n) — Euler's totient
- 34,464
- Sum of prime factors
- 734
Primality
Prime factorization: 2 2 × 3 2 × 5 × 719
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√129,420 = [359; (1, 2, 1, 718)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-nine thousand four hundred twenty
- Ordinal
- 129420th
- Binary
- 11111100110001100
- Octal
- 374614
- Hexadecimal
- 0x1F98C
- Base64
- AfmM
- One's complement
- 4,294,837,875 (32-bit)
- Scientific notation
- 1.2942 × 10⁵
- As a duration
- 129,420 s = 1 day, 11 hours, 57 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρκθυκʹ
- Mayan (base 20)
- 𝋰·𝋣·𝋫·𝋠
- Chinese
- 一十二萬九千四百二十
- Chinese (financial)
- 壹拾貳萬玖仟肆佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 129420, here are decompositions:
- 17 + 129403 = 129420
- 19 + 129401 = 129420
- 41 + 129379 = 129420
- 59 + 129361 = 129420
- 73 + 129347 = 129420
- 79 + 129341 = 129420
- 107 + 129313 = 129420
- 127 + 129293 = 129420
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 9F A6 8C (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.1.249.140.
- Address
- 0.1.249.140
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.249.140
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 129,420 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 129420 first appears in π at position 517,181 of the decimal expansion (the 517,181ordinal-suffix:st 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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.