Properties of the Number 18387

Eighteen Thousand Three Hundred Eighty-Seven

Basics

Value: 18386 → 18387 → 18388

Parity: odd

Prime: No

Previous Prime: 18379

Next Prime: 18397

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 227

Divisors: 1, 3, 9, 27, 81, 227, 681, 2043, 6129, 18387

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011111010011

Octal: 43723

Duodecimal: A783

Hexadecimal: 47d3

Square: 338081769

Square Root: 135.59867255987427

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

Expansion of ∏_k>=1 1/(1-x^2·k-1)^2·k-1. A262811

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250994

Number of 1-separable partitions of n; see Comments. A239467

Expansion of ∏_k>=1 1/(1+x^2·k-1)^2·k-1. A284628

A089450 indexed by A000040. A89525

Monotonic ordering of nonnegative differences 3ⁱ-6^j, for 40>= i>=0, j>=0. A192151

a(n) = floor(n*(n-1)*(n-2)*(n-3)/31). A11941

Number of (n+1)X(2+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250988

Number of (4+1)X(n+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction. A250998

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 721", based on the 5-celled von Neumann neighborhood. A273447