138,728
138,728 is a composite number, even.
138,728 (one hundred thirty-eight thousand seven hundred twenty-eight) is an even 6-digit number. It is a composite number with 8 divisors, and factors as 2³ × 17,341. Written other ways, in hexadecimal, 0x21DE8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 2,688
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 827,831
- Recamán's sequence
- a(491,371) = 138,728
- Square (n²)
- 19,245,457,984
- Cube (n³)
- 2,669,883,895,204,352
- Divisor count
- 8
- σ(n) — sum of divisors
- 260,130
- φ(n) — Euler's totient
- 69,360
- Sum of prime factors
- 17,347
Primality
Prime factorization: 2 3 × 17341
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,728 = [372; (2, 6, 10, 1, 4, 43, 1, 1, 1, 1, 1, 1, 185, 1, 1, 1, 1, 1, 1, 43, 4, 1, 10, 6, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand seven hundred twenty-eight
- Ordinal
- 138728th
- Binary
- 100001110111101000
- Octal
- 416750
- Hexadecimal
- 0x21DE8
- Base64
- Ah3o
- One's complement
- 4,294,828,567 (32-bit)
- Scientific notation
- 1.38728 × 10⁵
- As a duration
- 138,728 s = 1 day, 14 hours, 32 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληψκηʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋰·𝋨
- Chinese
- 一十三萬八千七百二十八
- Chinese (financial)
- 壹拾參萬捌仟柒佰貳拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138728, here are decompositions:
- 67 + 138661 = 138728
- 151 + 138577 = 138728
- 157 + 138571 = 138728
- 181 + 138547 = 138728
- 211 + 138517 = 138728
- 277 + 138451 = 138728
- 379 + 138349 = 138728
- 409 + 138319 = 138728
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B7 A8 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.232.
- Address
- 0.2.29.232
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.232
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 138,728 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 138728 first appears in π at position 784,743 of the decimal expansion (the 784,743ordinal-suffix:rd 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.