Properties of the Number 26391

Twenty-Six Thousand Three Hundred Ninety-One

Basics

Value: 26390 → 26391 → 26392

Parity: odd

Prime: No

Previous Prime: 26387

Next Prime: 26393

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 19 × 463

Divisors: 1, 3, 19, 57, 463, 1389, 8797, 26391

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110011100010111

Octal: 63427

Duodecimal: 13333

Hexadecimal: 6717

Square: 696484881

Square Root: 162.45307014642722

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

Sum of the largest parts in the partitions of n into 8 parts. A308998

a(0) = 16, after which, if (2·a(n-1)) - 1 = ∏_{k >= 1} (p_k)^c_k then a(n) = ∏_{k >= 1} (p_k-1)^c_k, where p_k indicates the k-th prime, A000040(k). A246345

Numerators b(n) of Pythagorean approximations b(n)/a(n) to 1/4. A195563

an=n-th smallest integer m=p1·p2·p3, product of 3 odd primes such that d+2m/d are all primes for d dividing 2m. A128278

Non-Brauer numbers. A349044

a(n) = 10000·log(n) rounded to nearest integer. A4244

G.f.: A(x) = exp( ∑_n>=1 (∑_k=0..2·n A027907(n,k)² * x^k / A(x)^k) * xⁿ/n ). A200377

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 323", based on the 5-celled von Neumann neighborhood. A271255

a(n) = ceiling(10000·log(n)). A4245

Expansion of 1/((1-2x)(1-6x)(1-7x)(1-10x)). A26391