Properties of the Number 15998

Fifteen Thousand Nine Hundred Ninety-Eight

Basics

Value: 15997 → 15998 → 15999

Parity: even

Prime: No

Previous Prime: 15991

Next Prime: 16001

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 × 19 × 421

Divisors: 1, 2, 19, 38, 421, 842, 7999, 15998

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11111001111110

Octal: 37176

Duodecimal: 9312

Hexadecimal: 3e7e

Square: 255936004

Square Root: 126.48320046551636

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) is the largest m such that there exists N such that none of S(N), S(N+1), ..., S(N+m-1) is divisible by n, where S(N) is the sum of digits of N. A331786

Number of n X 2 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4. A196204

Numbers k such that 255·2^k+1 is prime. A32504

a(n) = prime(n)² - prime(n+1). A62235

Molecular topological indices of the sunlet graphs. A192846

Number of 0..3 arrays of length n with each element differing from at least one neighbor by 2 or more, starting with 0. A221510

Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986). A323929

The number of oriented star-like and star trees with n arcs. A334827

Expansion of 1/sqrt((1 - x³ - x⁵)² - 4·x⁸). A376784

Expansion of 2·x²*(-2+9·x+3·x²)/((2·x²+5·x-1)*(2·x²-5·x+1)). A106835