138,890
138,890 is a composite number, even.
138,890 (one hundred thirty-eight thousand eight hundred ninety) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2 × 5 × 17 × 19 × 43. Its proper divisors sum to 146,230, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21E8A.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 29
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 98,831
- Recamán's sequence
- a(491,047) = 138,890
- Square (n²)
- 19,290,432,100
- Cube (n³)
- 2,679,248,114,369,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 285,120
- φ(n) — Euler's totient
- 48,384
- Sum of prime factors
- 86
Primality
Prime factorization: 2 × 5 × 17 × 19 × 43
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,890 = [372; (1, 2, 8, 2, 1, 744)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand eight hundred ninety
- Ordinal
- 138890th
- Binary
- 100001111010001010
- Octal
- 417212
- Hexadecimal
- 0x21E8A
- Base64
- Ah6K
- One's complement
- 4,294,828,405 (32-bit)
- Scientific notation
- 1.3889 × 10⁵
- As a duration
- 138,890 s = 1 day, 14 hours, 34 minutes, 50 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληωϟʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋤·𝋪
- Chinese
- 一十三萬八千八百九十
- Chinese (financial)
- 壹拾參萬捌仟捌佰玖拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138890, here are decompositions:
- 7 + 138883 = 138890
- 61 + 138829 = 138890
- 97 + 138793 = 138890
- 127 + 138763 = 138890
- 151 + 138739 = 138890
- 163 + 138727 = 138890
- 211 + 138679 = 138890
- 229 + 138661 = 138890
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 BA 8A (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.30.138.
- Address
- 0.2.30.138
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.30.138
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 138,890 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 138890 first appears in π at position 270,592 of the decimal expansion (the 270,592ordinal-suffix:nd 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.