Properties of the Number -1624

Six Hundred Twenty-Four

Basics

Value: -1625 → -1624 → -1623

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 7 × 29

Divisors: 1, 2, 4, 7, 8, 14, 28, 29, 56, 58

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11001011000

Octal: -3130

Duodecimal: -B34

Hexadecimal: -658

Square: 2637376

Square Root: 40.29888335921977

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) = (-n⁵ + 15·n⁴ - 65·n³ + 125·n² - 34·n + 40)/40. A161713

G.f. satisfies: A(x) = 1/(1 + x·A(x⁷)) and also the continued fraction: 1 + x·A(x⁸) = [1; 1/x, 1/x⁷, 1/x⁴⁹, 1/x³⁴³, ..., 1/x^{7^(n-1}), ...]. A101917

Triangle read by rows of coefficients of polynomials generated by the Han/Nekrasov-Okounkov formula. A234937

Expansion of ∏_n>0 ((1-xⁿ)/(1+xⁿ))^n² in powers of x. A285988

a(n) = a(n-1) - 2·a(n-2) - 3·a(n-3) - ... - (n-1)*a(1), with a(1) = a(2) = 2, a(3) = -2. A106541

Hankel transform of A158500. A158501

Expansion of ∏_k>=1 ((1 - k·x^k)/(1 + k·x^k)). A292317

First term of n-th difference sequence of (floor(k·r)), r = -sqrt(2), k >= 0. A325665

Triangle, T(n, k) = (1/2)*(n+2)! * [x^k]( p(x, n) ), where p(x,0) = 1, p(x,1) = -x, P(x, n) = (1/(n+1))*( (2·n-x)*P(x, n-1) - n·P(x, n-2) ), read by rows. A136532

Triangle read by rows: numerators of degenerate Bernoulli numbers written as powers of λ. A209123