Properties of the Number 18918

Eighteen Thousand Nine Hundred Eighteen

Basics

Value: 18917 → 18918 → 18919

Parity: even

Prime: No

Previous Prime: 18917

Next Prime: 18919

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1051

Divisors: 1, 2, 3, 6, 9, 18, 1051, 2102, 3153, 6306

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111100110

Octal: 44746

Duodecimal: AB46

Hexadecimal: 49e6

Square: 357890724

Square Root: 137.5427206361718

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 compositions of n with equal number of even and odd parts. A98123

a(n) = 13 + floor(∑_j=1..n-1 a(j)/2). A120140

Greatest integer k such that k/2ⁿ < sqrt(1/3). A293327

G.f. A(x) satisfies A(x) = 1 + x/A(-x·A(x)³)³. A384898

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A384898. A384903

Numbers k such that 10·13^k + 1 is prime. A57464

Interprimes which are of the form s·prime, s=18. A75293

Positive integers n such that the difference between the n-th prime and the sum of the divisors of n is congruent to 1 (mod n). A111359

Incorrect version of A045949. A229620

Numbers k sandwiched between twin primes, such that k times the reverse of k is also sandwiched between twin primes. A357076