Properties of the Number 12980

Twelve Thousand Nine Hundred Eighty

Basics

Value: 12979 → 12980 → 12981

Parity: even

Prime: No

Previous Prime: 12979

Next Prime: 12983

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 11 × 59

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11001010110100

Octal: 31264

Duodecimal: 7618

Hexadecimal: 32b4

Square: 168480400

Square Root: 113.92980294900892

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

G.f.: ∏_n>=1 (1 + xⁿ + xⁿ⁺¹). A160571

Numbers k such that the odd part of σ(σ(k)) is equal to the odd part of σ(k). A353365

Number of 2-separable partitions of n; see Comments. A239468

Expansion of 1/(1 - ∑_k>=0 x^(2·k+1²)). A280863

a(n) = ∑_k=1..n (k/gcd(n, k))². A332654

After initial 0, numbers k such that A327860(k) is a multiple of k. A351087

a(n) = 1000·n - 20. A157515

Number of transpose partition pairs of order n whose number of odd parts differ by numbers of the form 4·k + 2. A190101

Number of partitions of n that have even-sized Ferrers matrix. A238945

Number of partitions of n such that m(2) = m(3), where m = multiplicity. A240064