42,640
42,640 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 16
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 16 bits
- Reversed
- 4,624
- Recamán's sequence
- a(73,312) = 42,640
- Square (n²)
- 1,818,169,600
- Cube (n³)
- 77,526,751,744,000
- Divisor count
- 40
- σ(n) — sum of divisors
- 109,368
- φ(n) — Euler's totient
- 15,360
- Sum of prime factors
- 67
Primality
Prime factorization: 2 4 × 5 × 13 × 41
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- forty-two thousand six hundred forty
- Ordinal
- 42640th
- Binary
- 1010011010010000
- Octal
- 123220
- Hexadecimal
- 0xA690
- Base64
- ppA=
- One's complement
- 22,895 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓂍𓂍𓂍𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵μβχμʹ
- Mayan (base 20)
- 𝋥·𝋦·𝋬·𝋠
- Chinese
- 四萬二千六百四十
- Chinese (financial)
- 肆萬貳仟陸佰肆拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 42,640 = 8
- e — Euler's number (e)
- Digit 42,640 = 3
- φ — Golden ratio (φ)
- Digit 42,640 = 5
- √2 — Pythagoras's (√2)
- Digit 42,640 = 8
- ln 2 — Natural log of 2
- Digit 42,640 = 6
- γ — Euler-Mascheroni (γ)
- Digit 42,640 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 42640, here are decompositions:
- 29 + 42611 = 42640
- 71 + 42569 = 42640
- 83 + 42557 = 42640
- 107 + 42533 = 42640
- 131 + 42509 = 42640
- 149 + 42491 = 42640
- 167 + 42473 = 42640
- 173 + 42467 = 42640
Showing the first eight; more decompositions exist.
UTF-8 encoding: EA 9A 90 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.166.144.
- Address
- 0.0.166.144
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.166.144
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 42640 first appears in π at position 70,097 of the decimal expansion (the 70,097ordinal-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.