Properties of the Number 18658

Eighteen Thousand Six Hundred Fifty-Eight

Basics

Value: 18657 → 18658 → 18659

Parity: even

Prime: No

Previous Prime: 18637

Next Prime: 18661

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 19 × 491

Divisors: 1, 2, 19, 38, 491, 982, 9329, 18658

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011100010

Octal: 44342

Duodecimal: A96A

Hexadecimal: 48e2

Square: 348120964

Square Root: 136.5942897781602

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(1)=1, a(2)=2; for n >= 2, a(n+1) = a(n) + sum of prime factors of a(n). A96461

a(n+1) is the sum of a(n) and the prime factors of a(n), counted with multiplicity. Start with a(0) = 3. A192896

Expansion of g.f. ∑_n>=1 qⁿ/(1-qⁿ-q^3·n). A368688

Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1. A368702

Numbers n such that n!3 + 3³ is prime. A247886

Numbers k such that sopfr(k) = τ(k)³. A305349

a(n) = 3ⁿ - 2ⁿ⁺¹ - 1. A368956

a(1) = 7; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1. A25006

Composite numbers k such that (Bell(k+1) - Bell(k)) mod k = 1. A179279

Divisors of 808. A18658