Properties of the Number -6980

Nine Hundred Eighty

Basics

Value: -6981 → -6980 → -6979

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 349

Divisors: 1, 2, 4, 5, 10, 20, 349, 698, 1396, 1745

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1101101000100

Octal: -15504

Duodecimal: -4058

Hexadecimal: -1b44

Square: 48720400

Square Root: 83.54639429682169

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 1/(1 + x^4·k+3)^4·k+3. A285311

E.g.f.: A(x) = ∏_n>=0 { exp(x)*[∑_k=0..n (-x)^k/k! ] }. A129483

Number of perfect-power divisors of n!. A336416

a(n) = 1 + ∑_i=1..n (n-i+1)*φ(i). A5598

Irregular triangle read by rows where T(n,k) is the number of labeled simple graphs with n vertices and exactly k triangles, 0 <= k <= binomial(n,3). A372170

Number of labeled simple graphs on n vertices with exactly one triangle. A372172

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally. A251292

Numbers that are the sum of ten fourth powers in seven or more ways. A345600

Numbers that are the sum of ten fourth powers in exactly seven ways. A345859

Some numbers of the form 2·x³ + y³ + z³ found by a certain algorithm. A195006