42,638
42,638 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 23
- Digit product
- 1,152
- Digital root
- 5
- Palindrome
- No
- Bit width
- 16 bits
- Reversed
- 83,624
- Recamán's sequence
- a(73,316) = 42,638
- Square (n²)
- 1,817,999,044
- Cube (n³)
- 77,515,843,238,072
- Divisor count
- 4
- σ(n) — sum of divisors
- 63,960
- φ(n) — Euler's totient
- 21,318
- Sum of prime factors
- 21,321
Primality
Prime factorization: 2 × 21319
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- forty-two thousand six hundred thirty-eight
- Ordinal
- 42638th
- Binary
- 1010011010001110
- Octal
- 123216
- Hexadecimal
- 0xA68E
- Base64
- po4=
- One's complement
- 22,897 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓂍𓂍𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵μβχληʹ
- Mayan (base 20)
- 𝋥·𝋦·𝋫·𝋲
- Chinese
- 四萬二千六百三十八
- Chinese (financial)
- 肆萬貳仟陸佰參拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 42,638 = 1
- e — Euler's number (e)
- Digit 42,638 = 2
- φ — Golden ratio (φ)
- Digit 42,638 = 9
- √2 — Pythagoras's (√2)
- Digit 42,638 = 8
- ln 2 — Natural log of 2
- Digit 42,638 = 9
- γ — Euler-Mascheroni (γ)
- Digit 42,638 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 42638, here are decompositions:
- 61 + 42577 = 42638
- 67 + 42571 = 42638
- 139 + 42499 = 42638
- 151 + 42487 = 42638
- 181 + 42457 = 42638
- 229 + 42409 = 42638
- 241 + 42397 = 42638
- 307 + 42331 = 42638
Showing the first eight; more decompositions exist.
UTF-8 encoding: EA 9A 8E (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.166.142.
- Address
- 0.0.166.142
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.166.142
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 42638 first appears in π at position 37,250 of the decimal expansion (the 37,250ordinal-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.