Properties of the Number -805

Eight Hundred Five

Basics

Value: -806 → -805 → -804

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 7 × 23

Divisors: 1, 5, 7, 23, 35, 115, 161, 805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1100100101

Octal: -1445

Duodecimal: -571

Hexadecimal: -325

Square: 648025

Square Root: 28.372521918222215

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

Triangle T, read by rows, equal to the matrix product T = H*[C^-1]*H, where H is the self-inverse triangle A118433 and C is Pascal's triangle. A118435

Expansion of 1/(1+x²+x³). A77962

a(n) = A062295(n) - A133743(n). A133744

Expansion of f(-q², -q⁵)³ / (f(-q¹, -q⁶) * f(-q³, -q⁴)²) in powers of q where f(, ) is Ramanujan's general θ function. A262933

Expansion of 1/(1-2·x+x²+x³). A77941

G.f.: x^(k²+k/2)/(mul(1-xⁱ,i=1..k)*mul(1+x^r,r=1..oo)) with k = 3. A246582

Expansion of q·f(-q¹, -q⁶)³ / f(-q², -q⁵)² * f(-q³, -q⁴) in powers of q where f() is Ramanujan's two-variable θ function. A305443

Generalized sum of divisors function. A2130

Expansion of (1-x)/(1 + x² - x³). A78031

Expansion of (1 - x)^-1/(1 + 2·x - 2·x² + x³). A77918