Properties of the Number 15864

Fifteen Thousand Eight Hundred Sixty-Four

Basics

Value: 15863 → 15864 → 15865

Parity: even

Prime: No

Previous Prime: 15859

Next Prime: 15877

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 661

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 661, 1322

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110111111000

Octal: 36770

Duodecimal: 9220

Hexadecimal: 3df8

Square: 251666496

Square Root: 125.95237195067031

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) = r * (n-1)! where r is the rational number that satisfies the equation ∑_k>=n (-1)^{k + n}/C(k,n) = n·2^n-1*log(2) - r. A242091

Numbers n such that 3ⁿ + 2^n-1 is prime. A82103

Number of 4-covers of an unlabeled n-set. A5784

Let f(z) = z² + c, then row k lists the expansion of the n-fold composition f(f(...f(0)...)) in rising powers of c. A137560

Numbers k such that k and 5·k, taken together, are pandigital. A115925

a(n) = 441·n² - 2·n. A157737

(1/2)*A206803. A206804

Sum over all partitions of n of the GCD of the number of parts and the number of distinct parts. A339312

The number of partitions of n into parts so that there exists exactly one part whose multiplicity is equal to its value. A391611

Triangle by rows, related to the numbers of binary trees of height less than n, derived from the Mandelbrot set. A202019