Properties of the Number -9880

Eight Hundred Eighty

Basics

Value: -9881 → -9880 → -9879

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 5 × 13 × 19

Divisors: 1, 2, 4, 5, 8, 10, 13, 19, 20, 26

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

Today's Target

7925 Try Today's Challenge

Representations

Binary: -10011010011000

Octal: -23230

Duodecimal: -5874

Hexadecimal: -2698

Square: 97614400

Square Root: 99.39818911831343

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

Expansion of ∑_k>0 x^4·k/(1+x^k)⁴. A363616

Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6. A292

Sum of the first n even squares: a(n) = 2·n*(n+1)*(2·n+1)/3. A2492

Row sums of A168281. A168380

T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change -1,1 -1,2 1,0 or 0,-1. A264550

16-gonal (or hexadecagonal) numbers: a(n) = n*(7·n-6). A51868

Number of pairs of functions f, g from a size n set into itself satisfying f(g(f(x))) = f(f(f(x))). A239773

Number of compositions of n into 4 ordered relatively prime parts. A742

T(n,k)=Number of arrays of 2n nondecreasing integers in -k..k with sum zero and equal numbers greater than zero and less than zero. A203291

T(n,k) is the number of n X k 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors. A200801