Properties of the Number 18698

Eighteen Thousand Six Hundred Ninety-Eight

Basics

Value: 18697 → 18698 → 18699

Parity: even

Prime: No

Previous Prime: 18691

Next Prime: 18701

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 × 9349

Divisors: 1, 2, 9349, 18698

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100100001010

Octal: 44412

Duodecimal: A9A2

Hexadecimal: 490a

Square: 349615204

Square Root: 136.74063039199433

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(n) = floor(n*φ¹⁹), where φ is the golden ratio, A001622. A4934

Fibonacci sequence beginning 2, 6. A22112

One of the two successive approximations up to 13ⁿ for 13-adic integer sqrt(3). Here the 4 (mod 13) case (except for n = 0). A322085

Number of partitions of n into 3-smooth parts. A105420

Indices of prime tribonacci numbers, minus 1. A92835

a(n) = gcd(Lucas(n)+1, Fibonacci(n)-1). A115314

Positive numbers k such that -k, -(k + 1), and -(k + 2) are 3 consecutive negative negaFibonacci-Niven numbers (A331088). A331090

Smallest m such that A065623(m) = n. A65624

Half-indexed Lucas numbers second version L(n)=A000032=Lucas numbers a(0)=2, a(1)=2, a(2)=1, a(3)=2, a(4)=3, a(5)=3, a(2n)=L(n), for n>2: a(2n+1)=L(n)+L(n-3)=2·L(n-1) for n>5: a(n)+a(n+2)=a(n+4) a(2n)=L(n), so a(n)=L(n/2). A127218

a(n) = ∑_k=1..n k·C(n,k), where C(n,k) = number of binary sequences of length n and curling number k (A216955). A217941