138,740
138,740 is a composite number, even.
138,740 (one hundred thirty-eight thousand seven hundred forty) is an even 6-digit number. It is a composite number with 24 divisors, and factors as 2² × 5 × 7 × 991. Its proper divisors sum to 194,572, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21DF4.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 23
- Digit product
- 0
- Digital root
- 5
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 47,831
- Recamán's sequence
- a(491,347) = 138,740
- Square (n²)
- 19,248,787,600
- Cube (n³)
- 2,670,576,791,624,000
- Divisor count
- 24
- σ(n) — sum of divisors
- 333,312
- φ(n) — Euler's totient
- 47,520
- Sum of prime factors
- 1,007
Primality
Prime factorization: 2 2 × 5 × 7 × 991
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,740 = [372; (2, 10, 1, 24, 1, 3, 2, 4, 5, 2, 6, 46, 2, 2, 7, 1, 3, 1, 1, 1, 20, 1, 1, 1, …)]
Period length 42 — the block in parentheses repeats forever.
Representations
- In words
- one hundred thirty-eight thousand seven hundred forty
- Ordinal
- 138740th
- Binary
- 100001110111110100
- Octal
- 416764
- Hexadecimal
- 0x21DF4
- Base64
- Ah30
- One's complement
- 4,294,828,555 (32-bit)
- Scientific notation
- 1.3874 × 10⁵
- As a duration
- 138,740 s = 1 day, 14 hours, 32 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληψμʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋱·𝋠
- Chinese
- 一十三萬八千七百四十
- Chinese (financial)
- 壹拾參萬捌仟柒佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138740, here are decompositions:
- 13 + 138727 = 138740
- 61 + 138679 = 138740
- 79 + 138661 = 138740
- 103 + 138637 = 138740
- 163 + 138577 = 138740
- 181 + 138559 = 138740
- 193 + 138547 = 138740
- 223 + 138517 = 138740
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B7 B4 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.244.
- Address
- 0.2.29.244
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.244
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 138,740 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 138740 first appears in π at position 377,017 of the decimal expansion (the 377,017ordinal-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.