Properties of the Number 18018

Eighteen Thousand Eighteen

Basics

Value: 18017 → 18018 → 18019

Parity: even

Prime: No

Previous Prime: 18013

Next Prime: 18041

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 7 × 11 × 13

Divisors: 1, 2, 3, 6, 7, 9, 11, 13, 14, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001100010

Octal: 43142

Duodecimal: A516

Hexadecimal: 4662

Square: 324648324

Square Root: 134.23114392718256

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

Triangle read by rows: T(n,k) = C(n+k,n)*C(n,k)/(k+1), for n >= 0, k = 0..n. A88617

Triangle of coefficients of Legendre polynomials P_n (x). A8316

Unitary amicable numbers. A63991

Triangle (0 <= k <= n) read by rows: T(n, k) is the number of Schröder paths from (0,0) to (2n,0) having k peaks. A60693

Triangle of coefficients of normalized Legendre polynomials, with increasing exponents. A100258

Triangular array of Motzkin polynomial coefficients. A55151

Smaller of unitary amicable pair. A2952

Distinct even numbers in the triangle of denominators in Leibniz's Harmonic Triangle. A46204

Heinz numbers of integer partitions with as many even parts as odd conjugate parts and as many odd parts as even conjugate parts. A351980

T(n,k)=Number of 0..3 arrays of length n+2·k-1 with sum less than 3·k in any length 2k subsequence (=less than 50% duty cycle). A213464