138,818
138,818 is a composite number, even.
138,818 (one hundred thirty-eight thousand eight hundred eighteen) is an even 6-digit number. It is a composite number with 8 divisors, and factors as 2 × 31 × 2,239. Written other ways, in hexadecimal, 0x21E42.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 1,536
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 818,831
- Recamán's sequence
- a(491,191) = 138,818
- Square (n²)
- 19,270,437,124
- Cube (n³)
- 2,675,083,540,679,432
- Divisor count
- 8
- σ(n) — sum of divisors
- 215,040
- φ(n) — Euler's totient
- 67,140
- Sum of prime factors
- 2,272
Primality
Prime factorization: 2 × 31 × 2239
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,818 = [372; (1, 1, 2, 1, 1, 14, 1, 1, 1, 1, 1, 17, 1, 1, 4, 2, 2, 1, 2, 106, 12, 106, 2, 1, …)]
Period length 42 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand eight hundred eighteen
- Ordinal
- 138818th
- Binary
- 100001111001000010
- Octal
- 417102
- Hexadecimal
- 0x21E42
- Base64
- Ah5C
- One's complement
- 4,294,828,477 (32-bit)
- Scientific notation
- 1.38818 × 10⁵
- As a duration
- 138,818 s = 1 day, 14 hours, 33 minutes, 38 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληωιηʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋠·𝋲
- Chinese
- 一十三萬八千八百一十八
- Chinese (financial)
- 壹拾參萬捌仟捌佰壹拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138818, here are decompositions:
- 19 + 138799 = 138818
- 79 + 138739 = 138818
- 139 + 138679 = 138818
- 157 + 138661 = 138818
- 181 + 138637 = 138818
- 241 + 138577 = 138818
- 271 + 138547 = 138818
- 307 + 138511 = 138818
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B9 82 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.66.
- Address
- 0.2.30.66
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.66
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 138,818 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.