Properties of the Number -7980

Nine Hundred Eighty

Basics

Value: -7981 → -7980 → -7979

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 7 × 19

Divisors: 1, 2, 3, 4, 5, 6, 7, 10, 12, 14

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111100101100

Octal: -17454

Duodecimal: -4750

Hexadecimal: -1f2c

Square: 63680400

Square Root: 89.33084573650918

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

Exponential Riordan array [exp(x·exp(-x)),x]. A215652

Bi-diagonal inverse of (3n)!/(3k)!. A119832

Triangle T(n,k) which contains 16·n!*2^floor((n+1)/2) times the coefficient [tⁿ x^k] exp(t·x)/(15 + exp(8·t)) in row n, column k. A171685

a(n) = n*(n-1)*(n-2) (or n!/(n-3)!). A7531

Number of (weakly) unimodal compositions of n where all parts 1, 2, ..., m appear where m is the largest part. A227038

Convolution of A000203 with itself. A385

Numbers k such that k² divides 11^k - 1. A127092

Ordered areas of primitive Pythagorean triangles. A24406

Numbers that are divisible by exactly 5 different primes. A51270

Denominators of Cauchy numbers of second type (= Bernoulli numbers B_n⁽ⁿ⁾). A2790