Properties of the Number 43640

Forty-Three Thousand Six Hundred Forty

Basics

Value: 43639 → 43640 → 43641

Parity: even

Prime: No

Previous Prime: 43633

Next Prime: 43649

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 × 1091

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 1091, 2182

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010101001111000

Octal: 125170

Duodecimal: 21308

Hexadecimal: aa78

Square: 1904449600

Square Root: 208.90189084831187

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

Coefficients in the power series A(x) such that: 4 = ∑_n=-oo..+oo x^2·n+1 * (1 - xⁿ)ⁿ⁺¹ * A(x)ⁿ. A357404

a(n) = ∑_i=0..n ∑_j=0..n (i XOR j), where XOR is the binary logical exclusive-or operator. A224923

Number of squares and rectangles in the interior of the square with vertices (n,0), (0,n), (-n,0) and (0,-n) in a square (x,y)-grid. A330805

If a(n) is not a square, then a(n+1) = a(n) + a(n-1), else a(n+1) is the smallest positive integer not occurring earlier. A268133

Numbers k such that A284644(k) = A284644(k-1) = A284644(k-2) = A284644(k-3). A287118

a(0) = a(1) = 1; a(n+2) = ∑_k=0..n (binomial(n,k) mod 2) * a(k). A331520

Numbers whose base-10 representation has exactly 4 runs. A43640