Properties of the Number 18207

Eighteen Thousand Two Hundred Seven

Basics

Value: 18206 → 18207 → 18208

Parity: odd

Prime: No

Previous Prime: 18199

Next Prime: 18211

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 × 17 ²

Divisors: 1, 3, 7, 9, 17, 21, 51, 63, 119, 153

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011100011111

Octal: 43437

Duodecimal: A653

Hexadecimal: 471f

Square: 331494849

Square Root: 134.9333168642941

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 numbers whose base-3/2 expansion (see A024629) has n digits. A81848

a(n) = floor(a(n-1)*3/2) with a(1) = 2. A61418

3 times 9-gonal (or nonagonal) numbers: a(n) = 3·n*(7·n-5)/2. A152759

Triangle read by rows: T(n,k), n >=1, 0 <= k <= C(n,k), = number of n X n symmetric positive semi-definite matrices with 2's on the main diagonal and 1's and 0's elsewhere and with k 1's above the diagonal. A83029

Triangle T(n, k) = T(n-1, k) + T(n-1, k-1) + ((n+1)²*(n+2)²*(2·n² +6·n +3)/12)*T(n-2, k-1), read by rows. A154231

Number of walks on square lattice. A5565

Numbers m such that 20·m + 1, 80·m + 1, 100·m + 1, and 200·m + 1 are all primes. A372186

Sum of the first n n-digit primes less n·10^n-1. A114053

a(n) = 225·n² - 2·n. A158226

Number of subsets of {1,2,...,n-10} without differences equal to 2, 4, 6, 8 or 10. A224812