138,880
138,880 is a composite number, even.
138,880 (one hundred thirty-eight thousand eight hundred eighty) is an even 6-digit number. It is a composite number with 64 divisors, and factors as 2⁷ × 5 × 7 × 31. Its proper divisors sum to 252,800, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21E80.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 28
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 88,831
- Recamán's sequence
- a(491,067) = 138,880
- Square (n²)
- 19,287,654,400
- Cube (n³)
- 2,678,669,443,072,000
- Divisor count
- 64
- σ(n) — sum of divisors
- 391,680
- φ(n) — Euler's totient
- 46,080
- Sum of prime factors
- 57
Primality
Prime factorization: 2 7 × 5 × 7 × 31
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,880 = [372; (1, 1, 1, 185, 1, 1, 1, 744)]
Period length 8 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand eight hundred eighty
- Ordinal
- 138880th
- Binary
- 100001111010000000
- Octal
- 417200
- Hexadecimal
- 0x21E80
- Base64
- Ah6A
- One's complement
- 4,294,828,415 (32-bit)
- Scientific notation
- 1.3888 × 10⁵
- As a duration
- 138,880 s = 1 day, 14 hours, 34 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληωπʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋤·𝋠
- Chinese
- 一十三萬八千八百八十
- Chinese (financial)
- 壹拾參萬捌仟捌佰捌拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138880, here are decompositions:
- 11 + 138869 = 138880
- 17 + 138863 = 138880
- 59 + 138821 = 138880
- 83 + 138797 = 138880
- 149 + 138731 = 138880
- 197 + 138683 = 138880
- 233 + 138647 = 138880
- 239 + 138641 = 138880
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 BA 80 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.128.
- Address
- 0.2.30.128
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.128
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 138,880 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.