139,440
139,440 is a composite number, even.
139,440 (one hundred thirty-nine thousand four hundred forty) is an even 6-digit number. It is a composite number with 80 divisors, and factors as 2⁴ × 3 × 5 × 7 × 83. Its proper divisors sum to 360,528, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x220B0.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 21
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 44,931
- Recamán's sequence
- a(489,947) = 139,440
- Square (n²)
- 19,443,513,600
- Cube (n³)
- 2,711,203,536,384,000
- Divisor count
- 80
- σ(n) — sum of divisors
- 499,968
- φ(n) — Euler's totient
- 31,488
- Sum of prime factors
- 106
Primality
Prime factorization: 2 4 × 3 × 5 × 7 × 83
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√139,440 = [373; (2, 2, 2, 746)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-nine thousand four hundred forty
- Ordinal
- 139440th
- Binary
- 100010000010110000
- Octal
- 420260
- Hexadecimal
- 0x220B0
- Base64
- AiCw
- One's complement
- 4,294,827,855 (32-bit)
- Scientific notation
- 1.3944 × 10⁵
- As a duration
- 139,440 s = 1 day, 14 hours, 44 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρλθυμʹ
- Mayan (base 20)
- 𝋱·𝋨·𝋬·𝋠
- Chinese
- 一十三萬九千四百四十
- Chinese (financial)
- 壹拾參萬玖仟肆佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 139440, here are decompositions:
- 11 + 139429 = 139440
- 17 + 139423 = 139440
- 31 + 139409 = 139440
- 43 + 139397 = 139440
- 47 + 139393 = 139440
- 53 + 139387 = 139440
- 71 + 139369 = 139440
- 73 + 139367 = 139440
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A2 82 B0 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.32.176.
- Address
- 0.2.32.176
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.32.176
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 139,440 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 139440 first appears in π at position 296,294 of the decimal expansion (the 296,294ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.