Properties of the Number -18480

Eighteen Thousand Four Hundred Eighty

Basics

Value: -18481 → -18480 → -18479

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ⁴ × 3 × 5 × 7 × 11

Divisors: 1, 2, 3, 4, 5, 6, 7, 8, 10, 11

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100000110000

Octal: -44060

Duodecimal: -A840

Hexadecimal: -4830

Square: 341510400

Square Root: 135.94116374373144

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

Bisection of A002470. A2286

Irregular triangular array a(n,m) for third (k=3) convolution of Chebyshev's S(n,x) = U(n,x/2) polynomials, read by rows (n >=0, 0 <= m <= floor(n/2)). A128505

E.g.f.: exp(x²/(1 + x + x²)). A293589

Triangle of coefficients, read by rows, where T(n,k) is the coefficient of xⁿ*y^k in f(x,y) that satisfies f(x,y) = (1+x) - x²*(1+x)² + xy·f(x,y)². A86612

sech(tanh(x)*arctan(x))=1-12/4!*x⁴+480/6!*x⁶-18480/8!*x⁸... A12687

Triangle read by rows, coefficients of the Legendre polynomials P(n, x) times 2ⁿ: T(n, k) = 2ⁿ * [x^k] P(n, x), n >= 0, 0 <= k <= n. A157077

T(n,k) = binomial(n,k)*binomial(n+k,k), 0 <= k <= n, triangle read by rows. A63007

a(1)=1, a(2)=2; thereafter, a(n) is the smallest number m not yet in the sequence such that every prime that divides a(n-1) also divides m. A60735

The smallest representative of each (bigomega(n),ω(n)) pair. A70175

a(n) = (4·n)! / ((2·n)!*n!²). A897