Properties of the Number 22638

Twenty-Two Thousand Six Hundred Thirty-Eight

Basics

Value: 22637 → 22638 → 22639

Parity: even

Prime: No

Previous Prime: 22637

Next Prime: 22639

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 7 ³ × 11

Divisors: 1, 2, 3, 6, 7, 11, 14, 21, 22, 33

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101100001101110

Octal: 54156

Duodecimal: 11126

Hexadecimal: 586e

Square: 512479044

Square Root: 150.45929682143273

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

The least number k > A255334(n) for which A000203(k) = A000203(A255334(n)) and A007947(k) = A007947(A255334(n)), where A000203 gives the sum of divisors, and A007947 gives the squarefree kernel of n. A255423

Numbers n for which there exists k < n such that A000203(k) = A000203(n) and A007947(k) = A007947(n), where A000203 gives the sum of divisors, and A007947 gives the squarefree kernel of n. A255335

Numbers n such that for some m, A166133(m)=n, A166133(m+1)=n²-1, in increasing order. A256407

Triangle T(n,k) (n >= 2, 2 <= k <= n-1 if n > 2) giving number of non-crossing trees with n nodes and k endpoints. A72247

Seventh column of triangle A075502. A76002

a(n) = n·prime(prime(n)) - prime(n)². A230098

Numbers n such that n¹⁰²⁴ + (n+1)¹⁰²⁴ is prime. A274234

a(n) = (sqrt(7)*csc(π/7)/2)ⁿ + (-sqrt(7)*csc(2*π/7)/2)ⁿ + (-sqrt(7)*csc(4*π/7)/2)ⁿ. A275831

a(n) = floor( n^e ), e = 2.718281828... A61293

Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=2z. A212507