Properties of the Number 17990

Seventeen Thousand Nine Hundred Ninety

Basics

Value: 17989 → 17990 → 17991

Parity: even

Prime: No

Previous Prime: 17989

Next Prime: 18013

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 7 × 257

Divisors: 1, 2, 5, 7, 10, 14, 35, 70, 257, 514

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001000110

Octal: 43106

Duodecimal: A4B2

Hexadecimal: 4646

Square: 323640100

Square Root: 134.12680567284082

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

Weird numbers: abundant (A005101) but not pseudoperfect (A005835). A6037

Unitary weird numbers: unitary abundant (A034683) but not unitary pseudoperfect (A293188). A64114

Irregular triangle read by rows where T(n,k) is the number of labeled simple graphs with n vertices and exactly k triangles, 0 <= k <= binomial(n,3). A372170

Dying rabbits: a(n) = a(n-1) + a(n-2) - a(n-4). A23434

Expansion of 1/((1-2·x+x²-x³)*(1-x)). A77855

Bi-unitary weird numbers: bi-unitary abundant numbers (A292982) that are not bi-unitary pseudoperfect (A292985). A292986

Infinitary weird numbers: infinitary abundant numbers (A129656) that are not infinitary pseudoperfect numbers (A306983). A306984

Expansion of φ(-x⁶) / f(-x) in powers of·where φ(), f() are Ramanujan θ functions. A271661

Number of compositions of n into parts 2 and 3 with at least one 2 and one 3. A245332

Triangle read by rows: coefficients of expansion of certain weighted sums P₁(n,k) of Fibonacci numbers as a sum of powers. A341723