138,438
138,438 is a composite number, even.
138,438 (one hundred thirty-eight thousand four hundred thirty-eight) is an even 6-digit number. It is a composite number with 12 divisors, and factors as 2 × 3² × 7,691. Its proper divisors sum to 161,550, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21CC6.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 27
- Digit product
- 2,304
- Digital root
- 9
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 834,831
- Recamán's sequence
- a(491,951) = 138,438
- Square (n²)
- 19,165,079,844
- Cube (n³)
- 2,653,175,323,443,672
- Divisor count
- 12
- σ(n) — sum of divisors
- 299,988
- φ(n) — Euler's totient
- 46,140
- Sum of prime factors
- 7,699
Primality
Prime factorization: 2 × 3 2 × 7691
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,438 = [372; (13, 1, 3, 1, 1, 8, 1, 1, 1, 2, 2, 2, 4, 1, 3, 1, 3, 1, 1, 27, 372, 27, 1, 1, …)]
Period length 42 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand four hundred thirty-eight
- Ordinal
- 138438th
- Binary
- 100001110011000110
- Octal
- 416306
- Hexadecimal
- 0x21CC6
- Base64
- AhzG
- One's complement
- 4,294,828,857 (32-bit)
- Scientific notation
- 1.38438 × 10⁵
- As a duration
- 138,438 s = 1 day, 14 hours, 27 minutes, 18 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληυληʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋡·𝋲
- Chinese
- 一十三萬八千四百三十八
- Chinese (financial)
- 壹拾參萬捌仟肆佰參拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138438, here are decompositions:
- 5 + 138433 = 138438
- 11 + 138427 = 138438
- 31 + 138407 = 138438
- 37 + 138401 = 138438
- 67 + 138371 = 138438
- 89 + 138349 = 138438
- 101 + 138337 = 138438
- 127 + 138311 = 138438
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B3 86 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.28.198.
- Address
- 0.2.28.198
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.28.198
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 138,438 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 138438 first appears in π at position 490,199 of the decimal expansion (the 490,199ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.