Properties of the Number 39540

Thirty-Nine Thousand Five Hundred Forty

Basics

Value: 39539 → 39540 → 39541

Parity: even

Prime: No

Previous Prime: 39521

Next Prime: 39541

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 659

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001101001110100

Octal: 115164

Duodecimal: 1AA70

Hexadecimal: 9a74

Square: 1563411600

Square Root: 198.84667460131186

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

Numbers in the cycle-attractors of length=14 of the function f(x)=A063919(x). A97030

Numbers that are members of unitary σ aliquot cycles (union of unitary perfect, unitary amicable and unitary sociable numbers). A327157

Expansion of g.f. A(x) satisfying 2 = ∑_n=-oo..+oo (-1)ⁿ * xⁿ * (2·A(x) + x^2·n-1)ⁿ⁺¹. A363182

At stage 1, start with a unit square. At each successive stage add 4*(n-1) new squares around outside with edge-to-edge contacts. Sequence gives number of squares (regardless of size) at n-th stage. A56640

a(n) is the number of integers·that can be written x = (2^c(1) - 2^c(2) - 3·2^c(3) - 3²*2^c(4) - ... - 3^m-2*2^c(m) - 3^m-1) / 3^m for integers c(1), c(2), ..., c(m) such that n = c(1) > c(2) > ... > c(m) > 0 and c(1) - c(2) ≠ 2 if m >= 2. A131450

Structured truncated cubic numbers. A100152

Irregular triangle of cycles of purely periodic unitary σ aliquot sequences with their smallest member as starting number, read by rows. A336216

Number of length 2+2 0..n arrays with the sum of the maximum minus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero. A252178

Maximal planar degree sequences with n nodes. A7020

Consider the family of multigraphs enriched by the species of linear order. Sequence gives the triangle read by rows giving coefficients of polynomials arising from enumeration of those multigraphs on n edges, arcs and loops. A98288