Properties of the Number 12680

Twelve Thousand Six Hundred Eighty

Basics

Value: 12679 → 12680 → 12681

Parity: even

Prime: No

Previous Prime: 12671

Next Prime: 12689

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 × 317

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 317, 634

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000110001000

Octal: 30610

Duodecimal: 7408

Hexadecimal: 3188

Square: 160782400

Square Root: 112.60550608207397

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

a(0)=0, a(1)=1, a(2)=1, a(3)=1, a(n) = a(n-3) + a(n-4) for n > 3. A79398

a(n) = n*(8·n - 3). A139273

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254804

T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal median nondecreasing horizontally and vertically. A253820

Index of n-th prime in A386482, or -1 if that prime is missing. A386483

Iccanobirt numbers (4 of 15): a(n) = R(a(n-1)) + a(n-2) + a(n-3), where R is the digit reversal function A004086. A102114

Number of partitions of n such that (number parts having multiplicity 1) is a part or (number of parts > 1) is a part. A241515

Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 225", based on the 5-celled von Neumann neighborhood. A279991

G.f.: ∑_k>=1 x^2·k/(1-x^2·k) * ∏_k>=1 (1+x^k)/(1-x^k). A305104

Number of partitions of n containing the number of distinct parts as a part. A239945