138,128
138,128 is a composite number, even.
138,128 (one hundred thirty-eight thousand one hundred twenty-eight) is an even 6-digit number. It is a composite number with 20 divisors, and factors as 2⁴ × 89 × 97. Written other ways, in hexadecimal, 0x21B90.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 384
- Digital root
- 5
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 821,831
- Recamán's sequence
- a(492,571) = 138,128
- Square (n²)
- 19,079,344,384
- Cube (n³)
- 2,635,391,681,073,152
- Divisor count
- 20
- σ(n) — sum of divisors
- 273,420
- φ(n) — Euler's totient
- 67,584
- Sum of prime factors
- 194
Primality
Prime factorization: 2 4 × 89 × 97
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,128 = [371; (1, 1, 1, 9, 1, 1, 15, 3, 2, 3, 1, 3, 1, 5, 2, 1, 5, 8, 5, 1, 2, 5, 1, 3, …)]
Period length 36 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand one hundred twenty-eight
- Ordinal
- 138128th
- Binary
- 100001101110010000
- Octal
- 415620
- Hexadecimal
- 0x21B90
- Base64
- AhuQ
- One's complement
- 4,294,829,167 (32-bit)
- Scientific notation
- 1.38128 × 10⁵
- As a duration
- 138,128 s = 1 day, 14 hours, 22 minutes, 8 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ρληρκηʹ
- Mayan (base 20)
- 𝋱·𝋥·𝋦·𝋨
- Chinese
- 一十三萬八千一百二十八
- Chinese (financial)
- 壹拾參萬捌仟壹佰貳拾捌
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138128, here are decompositions:
- 181 + 137947 = 138128
- 337 + 137791 = 138128
- 421 + 137707 = 138128
- 541 + 137587 = 138128
- 691 + 137437 = 138128
- 769 + 137359 = 138128
- 787 + 137341 = 138128
- 877 + 137251 = 138128
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 AE 90 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.27.144.
- Address
- 0.2.27.144
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.27.144
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 138,128 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 138128 first appears in π at position 6,278 of the decimal expansion (the 6,278ordinal-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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.