Properties of the Number 18426

Eighteen Thousand Four Hundred Twenty-Six

Basics

Value: 18425 → 18426 → 18427

Parity: even

Prime: No

Previous Prime: 18413

Next Prime: 18427

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 37 × 83

Divisors: 1, 2, 3, 6, 37, 74, 83, 111, 166, 222

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011111111010

Octal: 43772

Duodecimal: A7B6

Hexadecimal: 47fa

Square: 339517476

Square Root: 135.74240310234677

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

Sum of the sixth largest parts of the partitions of n into 10 parts. A326593

Number of isomorphism classes of associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n, listed by class size. A79207

a(n) = 9·2ⁿ - 6. A89143

Fourth powers (n·n * n·n) in carryless arithmetic mod 10. A169886

a(0)=0; a(n) = n²*a(n-1) + 1. A66998

Number of isomorphism classes of associative non-commutative closed binary operations on a set of order n, listed by class size. A79200

Start with a single triangle; at n-th generation add a triangle at each vertex, allowing triangles to overlap; sequence gives number of triangles in n-th generation. A61776

Pentagonal numbers that are abundant. A379264

a(n) = 3·n*(9·n - 1)/2. A268351

Expansion of g.f. x*(x-1)*(x+1)³/((2·x³+x²-1)*(x⁴+1)). A107853