Properties of the Number 42643

Forty-Two Thousand Six Hundred Forty-Three

Basics

Value: 42642 → 42643 → 42644

Parity: odd

Prime: Yes

Previous Prime: 42641

Next Prime: 42649

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 42643

Divisors: 1, 42643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010011010010011

Octal: 123223

Duodecimal: 20817

Hexadecimal: a693

Square: 1818425449

Square Root: 206.50181597264466

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Noncomposite numbers in the southwestern ray of the Ulam spiral as oriented on the March 1964 cover of Scientific American. A168026

Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are > p/2. A282040

Largest prime factor of 2·n³ - 2·n + 9. A127990

Brazilian primes that are also the greater of a pair of twin primes. A306889

Primes that are palindromic in factorial base. A333421

Number of ordered triples (w,x,y) with all terms in {1,...,n} and w²+x²+y²>=2n. A211645

Primes of the form n² + n + 1, where n is semiprime. A193144

Primes that are reached by an ever increasing aliquot sequence. A234842

Numbers n such that for every k = 1, 2, ..., A305706(n)-1, it is possible to insert plus signs into the decimal representation of n^k to make sum equal n. A305707

Sequence is obtained from Catalan numbers (A000108) by taking the factorial of each digit and adding them up. A165163