Properties of the Number 13840

Thirteen Thousand Eight Hundred Forty

Basics

Value: 13839 → 13840 → 13841

Parity: even

Prime: No

Previous Prime: 13831

Next Prime: 13841

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ⁴ × 5 × 173

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11011000010000

Octal: 33020

Duodecimal: 8014

Hexadecimal: 3610

Square: 191545600

Square Root: 117.64352935882194

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

Central terms of triangle A181544. A183204

Number of n-digit 4th powers. A102831

Numbers m such that 2^m reversed is prime. A57708

Expansion of log(1+sinh(x)). A3704

Irregular triangle read by rows: T(n,k) = ∑_i=0..k (-1)ⁱ * binomial(4·n+1,i) * binomial(k+4-i,4)ⁿ, 0 <= k <= 4*(n-1). A236463

Triangle in which the g.f. for row n is [∑_k>=0 C(n+k-1,k)³*x^k]*(1-x)³ⁿ⁺¹, read by rows of k=0..2n terms. A181544

Binomial transform of [1, 7, 17, 17, 6, 0, 0, 0, ...]. A132117

Expansion of (1/x) * Series_Reversion( x*(1-x)³/(1+x) ). A365764

(A178476(n)-3)/9. A178486

Irregular table read by rows: Take an octagon with all diagonals drawn, as in A333075. Then T(n,k) = number of k-sided polygons in that figure for k >= 3. A333076