138,940
138,940 is a composite number, even.
138,940 (one hundred thirty-eight thousand nine hundred forty) is an even 6-digit number. It is a composite number with 12 divisors, and factors as 2² × 5 × 6,947. Its proper divisors sum to 152,876, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21EBC.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 25
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 49,831
- Recamán's sequence
- a(490,947) = 138,940
- Square (n²)
- 19,304,323,600
- Cube (n³)
- 2,682,142,720,984,000
- Divisor count
- 12
- σ(n) — sum of divisors
- 291,816
- φ(n) — Euler's totient
- 55,568
- Sum of prime factors
- 6,956
Primality
Prime factorization: 2 2 × 5 × 6947
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,940 = [372; (1, 2, 1, 17, 2, 3, 4, 2, 30, 1, 1, 1, 1, 2, 5, 1, 7, 2, 1, 6, 2, 20, 4, 8, …)]
Representations
- In words
- one hundred thirty-eight thousand nine hundred forty
- Ordinal
- 138940th
- Binary
- 100001111010111100
- Octal
- 417274
- Hexadecimal
- 0x21EBC
- Base64
- Ah68
- One's complement
- 4,294,828,355 (32-bit)
- Scientific notation
- 1.3894 × 10⁵
- As a duration
- 138,940 s = 1 day, 14 hours, 35 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληϡμʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋧·𝋠
- Chinese
- 一十三萬八千九百四十
- Chinese (financial)
- 壹拾參萬捌仟玖佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138940, here are decompositions:
- 3 + 138937 = 138940
- 17 + 138923 = 138940
- 23 + 138917 = 138940
- 41 + 138899 = 138940
- 47 + 138893 = 138940
- 71 + 138869 = 138940
- 257 + 138683 = 138940
- 293 + 138647 = 138940
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 BA BC (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.188.
- Address
- 0.2.30.188
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.188
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 138,940 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.