Properties of the Number 18444

Eighteen Thousand Four Hundred Forty-Four

Basics

Value: 18443 → 18444 → 18445

Parity: even

Prime: No

Previous Prime: 18443

Next Prime: 18451

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 29 × 53

Divisors: 1, 2, 3, 4, 6, 12, 29, 53, 58, 87

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100000001100

Octal: 44014

Duodecimal: A810

Hexadecimal: 480c

Square: 340181136

Square Root: 135.8086889709197

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 k such that k and k+1 have 4 distinct prime factors. A140078

T(n,k) is the number of (n+1) X (k+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A235212

Numbers k such that k and k+1 each have at least 4 distinct prime factors. A321504

a(n) = n! * ∑_k=1..n sigma₂(k)/k. A356298

Triangle read by rows: T(n,k) is the number of nonseparable planar maps with 2·n+1 edges and a fixed outer face of 2·k edges which are invariant under a rotation of a 1/2 turn. A91665

G.f. A(x) satisfies A(x/A(x)) = 1/(1-x)⁶. A145170

a(n) = a(n-1) + a(n-2), for n>=2, with a(0)=27, a(1)=2. A190994

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 310", based on the 5-celled von Neumann neighborhood. A281037

Expansion of ∏_k>=1 ((1 + x^k) / (1 - x^4·k))^k. A285458

Triangle of rooted planar maps, read by rows. A46652