139,128
139,128 is a composite number, even.
139,128 (one hundred thirty-nine thousand one hundred twenty-eight) is an even 6-digit number. It is a composite number with 64 divisors, and factors as 2³ × 3 × 11 × 17 × 31. Its proper divisors sum to 275,592, more than the number itself, making it an abundant number. It is the 527th triangular number. Written other ways, in hexadecimal, 0x21F78.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 24
- Digit product
- 432
- Digital root
- 6
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 821,931
- Recamán's sequence
- a(490,571) = 139,128
- Square (n²)
- 19,356,600,384
- Cube (n³)
- 2,693,045,098,225,152
- Divisor count
- 64
- σ(n) — sum of divisors
- 414,720
- φ(n) — Euler's totient
- 38,400
- Sum of prime factors
- 68
Primality
Prime factorization: 2 3 × 3 × 11 × 17 × 31
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√139,128 = [372; (1, 744)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-nine thousand one hundred twenty-eight
- Ordinal
- 139128th
- Binary
- 100001111101111000
- Octal
- 417570
- Hexadecimal
- 0x21F78
- Base64
- Ah94
- One's complement
- 4,294,828,167 (32-bit)
- Scientific notation
- 1.39128 × 10⁵
- As a duration
- 139,128 s = 1 day, 14 hours, 38 minutes, 48 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρλθρκηʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋰·𝋨
- Chinese
- 一十三萬九千一百二十八
- Chinese (financial)
- 壹拾參萬玖仟壹佰貳拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 139128, here are decompositions:
- 5 + 139123 = 139128
- 7 + 139121 = 139128
- 19 + 139109 = 139128
- 37 + 139091 = 139128
- 61 + 139067 = 139128
- 107 + 139021 = 139128
- 151 + 138977 = 139128
- 191 + 138937 = 139128
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 BD B8 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.31.120.
- Address
- 0.2.31.120
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.31.120
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 139,128 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 139128 first appears in π at position 762,839 of the decimal expansion (the 762,839ordinal-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
- Triangular numbers — 1, 3, 6, 10, 15 … the counting numbers stacked into triangles, and Gauss's famous shortcut for summing them.
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.