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Properties of the Number 18315

Eighteen Thousand Three Hundred Fifteen

Basics

Value: 18314 → 18315 → 18316

Parity: odd

Prime: No

Previous Prime: 18313

Next Prime: 18329

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 2 × 5 × 11 × 37

Divisors: 1, 3, 5, 9, 11, 15, 33, 37, 45, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011110001011

Octal: 43613

Duodecimal: A723

Hexadecimal: 478b

Square: 335439225

Square Root: 135.33292282367952

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

Numbers k such that φ(k) = φ(k+1). A1274
Number of degree-n even permutations of order exactly 2. A48099
Magic sums of 4 X 4 magic squares composed of squares. A271580
Triangle of coefficients, read by rows, where T(n,k) is the coefficient of xn*yk in f(x,y) that satisfies f(x,y) = (1+x) - x2*(1+x)3 + xy·f(x,y)3. A86634
a(n) = 3·T(A285984(n)), where T(m) is the m-th triangular number A000217(m). A286035
Number of ways to write n as an ordered sum of nine powers of 2. A342252
Odd nonsquarefree numbers k such that {sum of unitary divisors of k} plus {sum of squarefree divisors of k} >= 2·k. A389079
Integers k such that k·28·c + 1 is prime for c = 1, 2, 4, 7 and 14. A67199
A sequence derived from pentagonal numbers, or a Stirling number of the first kind matrix. A94952
9 times pentagonal numbers: 9·n*(3·n-1)/2. A152996