Properties of the Number 7855

Seven Thousand Eight Hundred Fifty-Five

Basics

Value: 7854 → 7855 → 7856

Parity: odd

Prime: No

Previous Prime: 7853

Next Prime: 7867

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 5 × 1571

Divisors: 1, 5, 1571, 7855

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111010101111

Octal: 17257

Duodecimal: 4667

Hexadecimal: 1eaf

Square: 61701025

Square Root: 88.62843787408192

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 of partitions of n that sorted in increasing order contain a part k in position k for some k. A238395

Expansion of 1/(1 - x - x² + x³ - x⁷ + x⁹ - x¹¹). A147663

a(n) = n*(7·n²-4)/3. A63521

Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X n square under all symmetry operations of the square; irregular triangle T(n,k), n>=2, 0<=k<=floor(n/2)², read by rows. A236679

Number T(n,k) of entries in the k-th blocks of all set partitions of [n] when blocks are ordered by increasing lengths (and increasing smallest elements); triangle T(n,k), n>=1, 1<=k<=n, read by rows. A319298

Centered 14-gonal numbers. A69127

Semiprimes in A056108. A113527

T(n,k)=Number of arrays of -k..k integers x(1..n) with every x(i) being in a substring of length 1 or 2 with sum zero. Array listed by antidiagonals. A193648

T(n,k)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 2,1,3,0,4 for x=0,1,2,3,4. A196696

Composite squarefree numbers n such that p + τ(n) divides n - φ(n), where p are the prime factors of n, τ(n) = A000005(n) and φ(n) = A000010(n). A229324