Properties of the Number 18665

Eighteen Thousand Six Hundred Sixty-Five

Basics

Value: 18664 → 18665 → 18666

Parity: odd

Prime: No

Previous Prime: 18661

Next Prime: 18671

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 5 × 3733

Divisors: 1, 5, 3733, 18665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011101001

Octal: 44351

Duodecimal: A975

Hexadecimal: 48e9

Square: 348382225

Square Root: 136.61991070118586

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

Number of integer compositions of n that are the first sums of more than one composition. A391628

a(n) = ∑_i=0..n digsum₉(i)³, where digsum₉(i) = A053830(i). A231686

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 563", based on the 5-celled von Neumann neighborhood. A283046

Numbers k such that the continued fraction for sqrt(k) has period 59. A20398

Numbers n such that 6·p(n)-1 and 6·p(n)+1 are twin primes and 6·p(n+1)-1 and 6·p(n+1)+1 are also twin primes with p(n) = n-th prime. A126655

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384749. A384751

a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0. A25001

Number of plane partitions of n with 5 parts. A391659

Divisors of 822. A18665