Properties of the Number 42689

Forty-Two Thousand Six Hundred Eighty-Nine

Basics

Value: 42688 → 42689 → 42690

Parity: odd

Prime: Yes

Previous Prime: 42683

Next Prime: 42697

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 42689

Divisors: 1, 42689

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1010011011000001

Octal: 123301

Duodecimal: 20855

Hexadecimal: a6c1

Square: 1822350721

Square Root: 206.6131651178114

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

Numbers k such that 2^k - 3 is prime. A50414

T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences. A210156

T(n,k)=Number of nXk array permutations with each element making zero or one knight moves. A189150

Prime numbers p for which the quintic polynomial x⁵ - x - 1 modulo p completely factors into linear polynomials. A135844

Prime numbers p not of the form 10·k+1 for which the quintic polynomial x⁵-x-1 modulus p is factorizable into five binomials. A135845

Numbers k such that (10^k - 1)/9 + 6 is prime. A97684

Numbers k for which 2·4^k - 27 is prime. A275767

Prime numbers p such that 2^p - 3 is prime. A283266

Primes of the form 20n²+8n+1. A154405

Number of n X 3 array permutations with each element making zero or one knight moves. A189146