138,520
138,520 is a composite number, even.
138,520 (one hundred thirty-eight thousand five hundred twenty) is an even 6-digit number. It is a composite number with 16 divisors, and factors as 2³ × 5 × 3,463. Its proper divisors sum to 173,240, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21D18.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 19
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 25,831
- Recamán's sequence
- a(491,787) = 138,520
- Square (n²)
- 19,187,790,400
- Cube (n³)
- 2,657,892,726,208,000
- Divisor count
- 16
- σ(n) — sum of divisors
- 311,760
- φ(n) — Euler's totient
- 55,392
- Sum of prime factors
- 3,474
Primality
Prime factorization: 2 3 × 5 × 3463
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,520 = [372; (5, 2, 8, 2, 2, 5, 2, 1, 2, 1, 3, 5, 1, 14, 2, 1, 5, 1, 2, 1, 8, 8, 4, 82, …)]
Representations
- In words
- one hundred thirty-eight thousand five hundred twenty
- Ordinal
- 138520th
- Binary
- 100001110100011000
- Octal
- 416430
- Hexadecimal
- 0x21D18
- Base64
- Ah0Y
- One's complement
- 4,294,828,775 (32-bit)
- Scientific notation
- 1.3852 × 10⁵
- As a duration
- 138,520 s = 1 day, 14 hours, 28 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρληφκʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋦·𝋠
- Chinese
- 一十三萬八千五百二十
- Chinese (financial)
- 壹拾參萬捌仟伍佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138520, here are decompositions:
- 3 + 138517 = 138520
- 23 + 138497 = 138520
- 59 + 138461 = 138520
- 71 + 138449 = 138520
- 113 + 138407 = 138520
- 131 + 138389 = 138520
- 149 + 138371 = 138520
- 197 + 138323 = 138520
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B4 98 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.24.
- Address
- 0.2.29.24
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.24
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 138,520 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.