138,800
138,800 is a composite number, even.
138,800 (one hundred thirty-eight thousand eight hundred) is an even 6-digit number. It is a composite number with 30 divisors, and factors as 2⁴ × 5² × 347. Its proper divisors sum to 195,628, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21E30.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 8,831
- Recamán's sequence
- a(491,227) = 138,800
- Square (n²)
- 19,265,440,000
- Cube (n³)
- 2,674,043,072,000,000
- Divisor count
- 30
- σ(n) — sum of divisors
- 334,428
- φ(n) — Euler's totient
- 55,360
- Sum of prime factors
- 365
Primality
Prime factorization: 2 4 × 5 2 × 347
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,800 = [372; (1, 1, 3, 1, 3, 8, 9, 3, 4, 1, 1, 1, 1, 2, 2, 14, 1, 3, 1, 2, 3, 1, 9, 29, …)]
Representations
- In words
- one hundred thirty-eight thousand eight hundred
- Ordinal
- 138800th
- Binary
- 100001111000110000
- Octal
- 417060
- Hexadecimal
- 0x21E30
- Base64
- Ah4w
- One's complement
- 4,294,828,495 (32-bit)
- Scientific notation
- 1.388 × 10⁵
- As a duration
- 138,800 s = 1 day, 14 hours, 33 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢
- Greek (Milesian)
- ͵ρληωʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋠·𝋠
- Chinese
- 一十三萬八千八百
- Chinese (financial)
- 壹拾參萬捌仟捌佰
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138800, here are decompositions:
- 3 + 138797 = 138800
- 7 + 138793 = 138800
- 37 + 138763 = 138800
- 61 + 138739 = 138800
- 73 + 138727 = 138800
- 139 + 138661 = 138800
- 163 + 138637 = 138800
- 223 + 138577 = 138800
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B8 B0 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.48.
- Address
- 0.2.30.48
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.48
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 138,800 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.