Properties of the Number 15945

Fifteen Thousand Nine Hundred Forty-Five

Basics

Value: 15944 → 15945 → 15946

Parity: odd

Prime: No

Previous Prime: 15937

Next Prime: 15959

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 1063

Divisors: 1, 3, 5, 15, 1063, 3189, 5315, 15945

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11111001001001

Octal: 37111

Duodecimal: 9289

Hexadecimal: 3e49

Square: 254243025

Square Root: 126.27351266199891

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 nonnegative integers that can be computed using exactly n n's and the four basic arithmetic operations {+, -, *, /}. A258097

Expansion of ∑_k>0 (1/(1 - k·x^k)³ - 1). A363639

Number of rooted trees with total weight n, where the weight of a node at height k is k (with the root considered to be at level 0). A117356

Generalized Bell numbers B_8,2. A91757

Number of mappings f:{1,2,3,...,n} -> {1,2,3,...,n} such that gcd(f(x),f(y)) = f(gcd(x,y)) for all x,y in {1,2,3,...,n}. A126025

Triangle read by rows: T(n,k) is the number of k-matchings of the corona L'(n) of the ladder graph L(n)=P₂ X P_n. and the complete graph K(1); in other words, L'(n) is the graph constructed from L(n) by adding for each vertex v a new vertex v' and the edge vv'. A102435

a(n) = n*(27·n³ + 22·n² - 21·n - 16)/12. A172085

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 245", based on the 5-celled von Neumann neighborhood. A271006

Triangle read by rows where row n is the largest (or middle or n-th) column of the reverse pyramid summation of order n described in A359087. A360145

Nonnegative integers that can be computed using exactly ten 10's and the four basic arithmetic operations {+, -, *, /}. A258071