138,820
138,820 is a composite number, even.
138,820 (one hundred thirty-eight thousand eight hundred twenty) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2² × 5 × 11 × 631. Its proper divisors sum to 179,708, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21E44.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 22
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 28,831
- Recamán's sequence
- a(491,187) = 138,820
- Square (n²)
- 19,270,992,400
- Cube (n³)
- 2,675,199,164,968,000
- Divisor count
- 24
- σ(n) — sum of divisors
- 318,528
- φ(n) — Euler's totient
- 50,400
- Sum of prime factors
- 651
Primality
Prime factorization: 2 2 × 5 × 11 × 631
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,820 = [372; (1, 1, 2, 2, 2, 1, 2, 2, 1, 7, 1, 2, 38, 1, 6, 1, 6, 1, 1, 1, 7, 9, 14, 1, …)]
Period length 52 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand eight hundred twenty
- Ordinal
- 138820th
- Binary
- 100001111001000100
- Octal
- 417104
- Hexadecimal
- 0x21E44
- Base64
- Ah5E
- One's complement
- 4,294,828,475 (32-bit)
- Scientific notation
- 1.3882 × 10⁵
- As a duration
- 138,820 s = 1 day, 14 hours, 33 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρληωκʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋡·𝋠
- Chinese
- 一十三萬八千八百二十
- Chinese (financial)
- 壹拾參萬捌仟捌佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138820, here are decompositions:
- 23 + 138797 = 138820
- 89 + 138731 = 138820
- 137 + 138683 = 138820
- 173 + 138647 = 138820
- 179 + 138641 = 138820
- 191 + 138629 = 138820
- 233 + 138587 = 138820
- 239 + 138581 = 138820
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B9 84 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.68.
- Address
- 0.2.30.68
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.68
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 138,820 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.