128,990
128,990 is a composite number, even.
128,990 (one hundred twenty-eight thousand nine hundred ninety) is an even 6-digit number. It is a composite number with 8 divisors, and factors as 2 × 5 × 12,899. Written other ways, in hexadecimal, 0x1F7DE.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 99,821
- Recamán's sequence
- a(231,660) = 128,990
- Square (n²)
- 16,638,420,100
- Cube (n³)
- 2,146,189,808,699,000
- Divisor count
- 8
- σ(n) — sum of divisors
- 232,200
- φ(n) — Euler's totient
- 51,592
- Sum of prime factors
- 12,906
Primality
Prime factorization: 2 × 5 × 12899
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√128,990 = [359; (6, 1, 1, 2, 3, 10, 1, 3, 9, 1, 6, 4, 1, 3, 2, 4, 51, 12, 6, 2, 4, 4, 1, 16, …)]
Representations
- In words
- one hundred twenty-eight thousand nine hundred ninety
- Ordinal
- 128990th
- Binary
- 11111011111011110
- Octal
- 373736
- Hexadecimal
- 0x1F7DE
- Base64
- Affe
- One's complement
- 4,294,838,305 (32-bit)
- Scientific notation
- 1.2899 × 10⁵
- As a duration
- 128,990 s = 1 day, 11 hours, 49 minutes, 50 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρκηϡϟʹ
- Mayan (base 20)
- 𝋰·𝋢·𝋩·𝋪
- Chinese
- 一十二萬八千九百九十
- Chinese (financial)
- 壹拾貳萬捌仟玖佰玖拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 128990, here are decompositions:
- 3 + 128987 = 128990
- 7 + 128983 = 128990
- 19 + 128971 = 128990
- 31 + 128959 = 128990
- 67 + 128923 = 128990
- 157 + 128833 = 128990
- 223 + 128767 = 128990
- 229 + 128761 = 128990
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.1.247.222.
- Address
- 0.1.247.222
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.247.222
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 128,990 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 128990 first appears in π at position 38,985 of the decimal expansion (the 38,985ordinal-suffix:th 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.