Properties of the Number 6856

Six Thousand Eight Hundred Fifty-Six

Basics

Value: 6855 → 6856 → 6857

Parity: even

Prime: No

Previous Prime: 6841

Next Prime: 6857

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 857

Divisors: 1, 2, 4, 8, 857, 1714, 3428, 6856

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101011001000

Octal: 15310

Duodecimal: 3B74

Hexadecimal: 1ac8

Square: 47004736

Square Root: 82.80096617793781

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

Number A(n,k) of pairs of endofunctions f, g on [n] satisfying f(g^k(i)) = f(i) for all i in [n]; square array A(n,k), n>=0, k>=0, read by antidiagonals. A245910

T(n,k) is the number of length n+1 0..2·k arrays with the sum of the absolute values of adjacent differences equal to n·k. A249982

Sum of the fifth largest parts of the partitions of n into 8 squarefree parts. A326448

T(n,k) is the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A235017

Sets of 4 consecutive numbers with equal number of divisors. A39665

Sum of odd-indexed primes. A77131

n³+Smallest square, (Smallest square >= n³). A176581

a(n) = 2·A000984(n) - (n+1). A134759

Least k such that prime(n) is the smallest prime p for which k² + p² is also prime, or 0 if none. A263466

Maximal term of TRIP-Stern sequence of level n corresponding to permutation triple (e,132,e). A271489