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Properties of the Number 18528

Eighteen Thousand Five Hundred Twenty-Eight

Basics

Value: 18527 → 18528 → 18529

Parity: even

Prime: No

Previous Prime: 18523

Next Prime: 18539

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 5 × 3 × 193

Divisors: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100001100000

Octal: 44140

Duodecimal: A880

Hexadecimal: 4860

Square: 343286784

Square Root: 136.11759621738844

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) = p*(p-1)/2 for p = prime(n). A8837
Main diagonal of array in A358304, divided by 2. A358307
Numbers k such that 9k - 2 is a prime. A128455
T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically. A207242
T(n,k)=Number of nXk 0..3 arrays with no element equal to the sum of elements to its left or the sum of the elements above it or the sum of the elements diagonally to its northwest or the sum of the elements antidiagonally to its northeast, modulo 4. A240250
Numbers k such that the symmetric representation of σ(k) has only two parts and they meet at the center of the Dyck path. A262259
T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 0 vertically. A208164
T(n,k)=Number of nXk 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal. A206987
T(n,k)=Number of nXk nonnegative integer arrays with upper left 0 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down. A252836
a(n) = 3·n*(6·n + 1). A144314