Properties of the Number 7856

Seven Thousand Eight Hundred Fifty-Six

Basics

Value: 7855 → 7856 → 7857

Parity: even

Prime: No

Previous Prime: 7853

Next Prime: 7867

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ⁴ × 491

Divisors: 1, 2, 4, 8, 16, 491, 982, 1964, 3928, 7856

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1111010110000

Octal: 17260

Duodecimal: 4668

Hexadecimal: 1eb0

Square: 61716736

Square Root: 88.63407922464135

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) = 9ⁿ+6ⁿ-1ⁿ. A155647

G.f.: 1 / (1 + 12·x*G(x)⁴ - 16·x*G⁵) where G(x) = 1 + x·G(x)⁶ is the g.f. of A002295. A226705

Lesser of two consecutive numbers each divisible by a fourth power. A68782

Number of asymmetric orthoplex n-ominoes with cell centers determining n-3 space. A355051

8-step Fibonacci sequence starting with 0,0,0,0,1,0,0,0. A251741

Lexicographically first sequence of distinct terms such that any set of four successive digits can be reordered as {d, d+1, d+2, d+3}, d being the smallest of the four digits. A302499

Numbers k such that k and k + 1 are both of the form p·q⁴ where p and q are distinct primes. A215197

a(n) = 5·2ⁿ + 3ⁿ + 15. A254368

G.f. satisfies A(x) = 1 + x⁵*A(x)³ / (1 - x·A(x)). A365700

Numbers n such that T(n) + T(n+1) + ... + T(n+22) is a square, where T = A000217 (triangular numbers). A257707