Properties of the Number 26840

Twenty-Six Thousand Eight Hundred Forty

Basics

Value: 26839 → 26840 → 26841

Parity: even

Prime: No

Previous Prime: 26839

Next Prime: 26849

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 5 × 11 × 61

Divisors: 1, 2, 4, 5, 8, 10, 11, 20, 22, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 110100011011000

Octal: 64330

Duodecimal: 13648

Hexadecimal: 68d8

Square: 720385600

Square Root: 163.82917933017916

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 σ(k) = σ(k+10). A15880

Coefficients of 1/sqrt(1-4·x-8·x²); also, a(n) is the central coefficient of (1+2·x+3·x²)ⁿ. A84609

a(n) = 2·n*(7·n - 3). A316466

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8. A252053

Sum of all squarefree semiprimes with greater prime factor prime(n). A339194

Triangle, read by rows, where the n-th row lists the (2n+1) coefficients of (1+2·x+3·x²)ⁿ. A84608

Expansion of exp( ∑_n>=1 -σ(8·n)*xⁿ/n ) in powers of x. A283168

Smallest Fibonacci number that has n as a factor, divided by n. A37943

Number of directed loopless multigraphs with n arcs. A52170

Fibonacci quotients: Fibonacci(p - Legendre(p∣5))/p where p runs through the primes. A92330