138,440
138,440 is a composite number, even.
138,440 (one hundred thirty-eight thousand four hundred forty) is an even 6-digit number. It is a composite number with 16 divisors, and factors as 2³ × 5 × 3,461. Its proper divisors sum to 173,140, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21CC8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 44,831
- Recamán's sequence
- a(491,947) = 138,440
- Square (n²)
- 19,165,633,600
- Cube (n³)
- 2,653,290,315,584,000
- Divisor count
- 16
- σ(n) — sum of divisors
- 311,580
- φ(n) — Euler's totient
- 55,360
- Sum of prime factors
- 3,472
Primality
Prime factorization: 2 3 × 5 × 3461
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,440 = [372; (13, 3, 2, 14, 1, 3, 9, 6, 23, 1, 5, 3, 2, 1, 1, 4, 1, 7, 1, 1, 5, 1, 2, 1, …)]
Representations
- In words
- one hundred thirty-eight thousand four hundred forty
- Ordinal
- 138440th
- Binary
- 100001110011001000
- Octal
- 416310
- Hexadecimal
- 0x21CC8
- Base64
- AhzI
- One's complement
- 4,294,828,855 (32-bit)
- Scientific notation
- 1.3844 × 10⁵
- As a duration
- 138,440 s = 1 day, 14 hours, 27 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληυμʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋢·𝋠
- Chinese
- 一十三萬八千四百四十
- Chinese (financial)
- 壹拾參萬捌仟肆佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138440, here are decompositions:
- 7 + 138433 = 138440
- 13 + 138427 = 138440
- 37 + 138403 = 138440
- 67 + 138373 = 138440
- 103 + 138337 = 138440
- 151 + 138289 = 138440
- 157 + 138283 = 138440
- 193 + 138247 = 138440
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B3 88 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.28.200.
- Address
- 0.2.28.200
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.28.200
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 138,440 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 138440 first appears in π at position 163,163 of the decimal expansion (the 163,163ordinal-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.