Properties of the Number 18228

Eighteen Thousand Two Hundred Twenty-Eight

Basics

Value: 18227 → 18228 → 18229

Parity: even

Prime: No

Previous Prime: 18223

Next Prime: 18229

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 7 ² × 31

Divisors: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011100110100

Octal: 43464

Duodecimal: A670

Hexadecimal: 4734

Square: 332259984

Square Root: 135.01111065390137

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

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits. A262420

Partial sums of A053739. A53295

a(n) = 2025·n² + n. A156856

a(n) = n*(67·n - 89)/2. A263227

Sum along upward diagonal of Pascal triangle from (but not including) halfway point. A10758

Sum along upward diagonal of Pascal triangle from halfway point. A10759

a(n) = T(n, 2·n-10), T given by A027926. A27933

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 90. A31768

Sum of the absolute values in row n of A118686. A119489

Eigentriangle of triangle A022166: T(n,k) = A022166(n,k) * A125812(k). A143774