Properties of the Number 43920

Forty-Three Thousand Nine Hundred Twenty

Basics

Value: 43919 → 43920 → 43921

Parity: even

Prime: No

Previous Prime: 43913

Next Prime: 43933

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ² × 5 × 61

Divisors: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010101110010000

Octal: 125620

Duodecimal: 21500

Hexadecimal: ab90

Square: 1928966400

Square Root: 209.57099035887578

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) = Fibonacci(n)*A008653(n) for n>=1, with a(0)=1, where A008653 is the θ series of direct sum of 2 copies of hexagonal lattice. A205967

Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P. A225385

Numerators b(n) of Pythagorean approximations b(n)/a(n) to 1/2. A195548

Denominators a(n) of Pythagorean approximations b(n)/a(n) to 2. A195614

T(n,k) is the number of posets of n labeled elements with k covering relations (n>=1, k>=0). Triangle read by rows. A342589

a(n) = A000111(n) * A000142(n). Row sums of A373434. A373433

a(n) = 3·a(n-1) - 7·a(n-2), with a(0)=0, a(1)=1. A190961

a(n) = ((p-1)!/(2·p²)) * ∑_j=1..p-1 1/j where p is the n-th prime. A79303

Coefficient of x^30-n in the minimal polynomial for 2^1/6+3^1/5. A35616

Number of active (ON, black) cells at stage 2ⁿ-1 of the two-dimensional cellular automaton defined by "Rule 801", based on the 5-celled von Neumann neighborhood. A273574