Properties of the Number 18486

Eighteen Thousand Four Hundred Eighty-Six

Basics

Value: 18485 → 18486 → 18487

Parity: even

Prime: No

Previous Prime: 18481

Next Prime: 18493

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 13 × 79

Divisors: 1, 2, 3, 6, 9, 13, 18, 26, 39, 78

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

603 Try Today's Challenge

Representations

Binary: 100100000110110

Octal: 44066

Duodecimal: A846

Hexadecimal: 4836

Square: 341732196

Square Root: 135.9632303234959

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 ways to place 2 nonattacking knights on an n X n board. A172132

T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nXk array. A219686

Number of ways to write n as an ordered sum of 6 prime powers (including 1). A341135

E.g.f.: A(x,y) = exp(y)*P(x) - Q(x,y), where P(x) = 1/∏_n>=1 (1 - xⁿ/n) and Q(x,y) = ∑_n>=1 yⁿ / ∏_k=1..n (k - x^k). A249480

Numbers k such that the three second-degree cyclotomic polynomials x² + 1, x² - x + 1 and x² + x + 1 are simultaneously prime when evaluated at x=k. A87277

Number of partitions p of n not including ceiling(mean(p)) as a part. A241337

Numbers n such that n and n+1 are differences between 2 positive cubes in at least one way. A38594

a(n) = n·A002088(n). A143270

Numbers equal to the sum of three oblong numbers in arithmetic progression. A292314

Solution to the Dancing School Problem with 4 girls and n+4 boys: f(4,n). A79909