128,142
128,142 is a composite number, even.
128,142 (one hundred twenty-eight thousand one hundred forty-two) is an even 6-digit number. It is a composite number with 40 divisors, and factors as 2 × 3⁴ × 7 × 113. Its proper divisors sum to 202,914, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x1F48E.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 18
- Digit product
- 128
- Digital root
- 9
- Palindrome
- No
- Bit width
- 17 bits
- Reversed
- 241,821
- Recamán's sequence
- a(32,568) = 128,142
- Square (n²)
- 16,420,372,164
- Cube (n³)
- 2,104,139,329,839,288
- Divisor count
- 40
- σ(n) — sum of divisors
- 331,056
- φ(n) — Euler's totient
- 36,288
- Sum of prime factors
- 134
Primality
Prime factorization: 2 × 3 4 × 7 × 113
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√128,142 = [357; (1, 31, 1, 1, 5, 5, 1, 2, 1, 3, 2, 79, 9, 3, 1, 1, 50, 1, 1, 3, 9, 79, 2, 3, …)]
Period length 34 — the block in parentheses repeats forever.
Representations
- In words
- one hundred twenty-eight thousand one hundred forty-two
- Ordinal
- 128142nd
- Binary
- 11111010010001110
- Octal
- 372216
- Hexadecimal
- 0x1F48E
- Base64
- AfSO
- One's complement
- 4,294,839,153 (32-bit)
- Scientific notation
- 1.28142 × 10⁵
- As a duration
- 128,142 s = 1 day, 11 hours, 35 minutes, 42 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵ρκηρμβʹ
- Mayan (base 20)
- 𝋰·𝋠·𝋧·𝋢
- Chinese
- 一十二萬八千一百四十二
- Chinese (financial)
- 壹拾貳萬捌仟壹佰肆拾貳
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 128142, here are decompositions:
- 23 + 128119 = 128142
- 29 + 128113 = 128142
- 31 + 128111 = 128142
- 43 + 128099 = 128142
- 89 + 128053 = 128142
- 109 + 128033 = 128142
- 163 + 127979 = 128142
- 191 + 127951 = 128142
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 9F 92 8E (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.1.244.142.
- Address
- 0.1.244.142
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.1.244.142
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 128,142 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 128142 first appears in π at position 515,931 of the decimal expansion (the 515,931ordinal-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°.