Properties of the Number 26721

Twenty-Six Thousand Seven Hundred Twenty-One

Basics

Value: 26720 → 26721 → 26722

Parity: odd

Prime: No

Previous Prime: 26717

Next Prime: 26723

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2969

Divisors: 1, 3, 9, 2969, 8907, 26721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 110100001100001

Octal: 64141

Duodecimal: 13569

Hexadecimal: 6861

Square: 714011841

Square Root: 163.46559270990332

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

a(n) = ∑_i=0..n digsum₉(i)³, where digsum₉(i) = A053830(i). A231686

Terms k of A228058 such that gcd(k - A048250(k), A162296(k) - k) = A162296(k) - k. A325376

Numbers k in A228058 such that also A001065(k) is in A228058. A325380

Number of nX7 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero. A297813

Numbers k such that 89·2^k+1 is prime. A32394

Solutions to A096509[x]=6; number of prime-powers [including primes] in the neighborhood of·with Ceiling[Log[x]] radius equals 6. A96517

T(n,k)=Number of nXk 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero. A297814

T(n,0) + T(n,1) + ... + T(n,n), T given by A026714. A26721