Properties of the Number -15985

Fifteen Thousand Nine Hundred Eighty-Five

Basics

Value: -15986 → -15985 → -15984

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 23 × 139

Divisors: 1, 5, 23, 115, 139, 695, 3197, 15985

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11111001110001

Octal: -37161

Duodecimal: -9301

Hexadecimal: -3e71

Square: 255520225

Square Root: 126.43179979736111

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

Centered 24-gonal numbers. A69190

a(n) = 5·a(n-1) - a(n-2) + 1 with a(0)=1, a(1)=6. A89817

Numbers k such that 6·k+1, 6·k+7, 6·k+13, 6·k+19 are consecutive primes. A90839

Alternate partial sums of the binomial coefficients binomial(3·n,n). A188676

Number of squares on infinite chessboard at <= n knight's moves from a fixed square. A18836

Numbers n such that 6n+5, 6n+11, 6n+17, 6n+23 are consecutive primes or 6n+1, 6n+7, 6n+13, 6n+19 are consecutive primes. A90833

Numbers whose base-3 representation is a square when read in base 10. A267763

Number of integer partitions of n with a unique non-co-mode. A363129

Numbers k such that k divides the numerator of B(2k) (the Bernoulli numbers), but gcd(3k, 8^k+1) > 3. A70192

a(n) = (n-1)*(n-2)³ - A003878(n-3), with a(1) = a(2) = 0 and a(3) = 2. A75681