Properties of the Number 1580

One Thousand Five Hundred Eighty

Basics

Value: 1579 → 1580 → 1581

Parity: even

Prime: No

Previous Prime: 1579

Next Prime: 1583

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 79

Divisors: 1, 2, 4, 5, 10, 20, 79, 158, 316, 395

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11000101100

Octal: 3054

Duodecimal: AB8

Hexadecimal: 62c

Square: 2496400

Square Root: 39.74921382870358

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(n) = n*(4·n-1). A33991

Triangle, read by rows of n²+1 terms, of coefficients of q in the q-analog of the even double factorials: T(n,k) = [q^k] ∏_j=1..n (1-q^2j)/(1-q) for n>0, with T(0,0)=1. A128084

a(n) = a(n-1) + a(n-2) + a(n-3); a(0) = -1, a(1) = 2, a(2) = 2. A100683

Coordination sequence for "reo" 3D uniform tiling. A299279

Even triangular numbers halved. A74378

Number of compositions of n with uniform Lyndon factorization and uniform co-Lyndon factorization. A329398

If A151873 is regarded as a triangle then the rows converge to this sequence. A151874

The main column of a version of the square spiral. A156859

Irregular triangle read by rows: Take a regular n-sided polygon (n>=3) with all diagonals drawn, as in A007678. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., max_k. A331450

a(n) = ∑_{d divides n} d^{n/d + 1}. A78308