Properties of the Number 26857

Twenty-Six Thousand Eight Hundred Fifty-Seven

Basics

Value: 26856 → 26857 → 26858

Parity: odd

Prime: No

Previous Prime: 26849

Next Prime: 26861

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 107 × 251

Divisors: 1, 107, 251, 26857

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110100011101001

Octal: 64351

Duodecimal: 13661

Hexadecimal: 68e9

Square: 721298449

Square Root: 163.88105442667862

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

Pisot sequence T(5,21), a(n) = floor( a(n-1)²/a(n-2) ). A10925

Main diagonal of array in A083140. A83141

a(1) = 1; a(n+1) = 1 + ∏_k∣n a(k), product is over the positive divisors, k, of n. A68334

Expansion of 1/sqrt((1-x)²-12x⁴). A98484

a(n) = 4·a(n-1) + a(n-2) - a(n-3) - a(n-5). A19992

Odd composites (including 1 in the count) where the number 1 mod 4 equals the number 3 mod 4. A93180

Number of rooted noncrossing trees with n nodes such that root has degree 1 and the child of the root has degree at least 2. A30983

a(n) = T(2n+1,n+4), T given by A026736. A26857