Properties of the Number 43690

Forty-Three Thousand Six Hundred Ninety

Basics

Value: 43689 → 43690 → 43691

Parity: even

Prime: No

Previous Prime: 43669

Next Prime: 43691

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 17 × 257

Divisors: 1, 2, 5, 10, 17, 34, 85, 170, 257, 514

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010101010101010

Octal: 125252

Duodecimal: 2134A

Hexadecimal: aaaa

Square: 1908816100

Square Root: 209.02152999152983

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(2n) = 2·a(2n-1), a(2n+1) = 2·a(2n)+1 (also a(n) is the n-th number without consecutive equal binary digits). A975

Numbers of the form 2^n-1*(2^n·m-1)/(2ⁿ-1), n >= 1, m >= 1. A272919

Expansion of (1 - x)/((1 + x)*(1 - 2·x)). A78008

a(n) = (2/3)*(4ⁿ-1). A20988

Number of 132 and 213-avoiding derangements of {1,2,...,n}. A61547

a(n) = a(n-1) + 2·a(n-2) + 2, for n>=3, where a(0)= 1, a(1)= 2, a(2)= 4. A26644

A024494 prefixed by a 0. A131708

a(n) = C(n,1) + C(n,4) + ... + C(n, 3·floor(n/3) + 1). A24494

Prime factorization of n+1 encoded with the run lengths of binary expansion. A75158

G.f.: (1+x)/(1+x-2·x²). A151575