Properties of the Number -1280

Two Hundred Eighty

Basics

Value: -1281 → -1280 → -1279

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ⁸ × 5

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10100000000

Octal: -2400

Duodecimal: -8A8

Hexadecimal: -500

Square: 1638400

Square Root: 35.77708763999664

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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 of coefficients of Chebyshev's T(n,x) polynomials (powers of·in increasing order). A53120

Triangle read by rows: terms of a binomial decomposition of 0^n-1 as Sum(k=0..n)T(n,k). A244129

Triangle of coefficients of Chebyshev polynomials T_n(x). A8310

Coefficients of Chebyshev polynomials of the first kind: triangle of coefficients in expansion of cos(n·x) in descending powers of cos(x). A28297

Expansion of ψ(x) / φ(x) in powers of·where φ(), ψ() are Ramanujan θ functions. A83365

Triangle of coefficients of cos(x)ⁿ in polynomial for cos(nx). A39991

Triangle read by rows: T satisfies the matrix products: C·T*C = T^-1 and T·C*T = C^-1, where C is Pascal's triangle. A118800

Coefficient table for Chebyshev polynomials T(2·n,x) (increasing even powers x, without zeros). A127674

Numerators of coefficients of integrated Chebyshev polynomials T(n,x) (in increasing order of powers of x). A164658

Expansion of ψ(x)² * φ(-x)⁶ in powers of·where φ(), ψ() are Ramanujan θ functions. A227695