Properties of the Number 18421

Eighteen Thousand Four Hundred Twenty-One

Basics

Value: 18420 → 18421 → 18422

Parity: odd

Prime: No

Previous Prime: 18413

Next Prime: 18427

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 13 ² × 109

Divisors: 1, 13, 109, 169, 1417, 18421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011111110101

Octal: 43765

Duodecimal: A7B1

Hexadecimal: 47f5

Square: 339333241

Square Root: 135.72398461583714

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

Decimal part of a(n)^1/2 starts with a 'nine digits' anagram. A34277

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

G.f.: ∑_k>=0 x^k * ∏_j=1..5·k (1 + x^j). A385069

Numbers n such that Maple 9.5, Maple 10, Maple 11 and Maple 12 give the wrong answers for the number of partitions of n. A110375

The index of the first of two consecutive positive triangular numbers (A000217) the sum of which is equal to the sum of three consecutive positive triangular numbers. A262489

Integers n such that for all i > n the largest prime factor of i(i+1)(i+2)(i+3)(i+4)(i+5) exceeds the largest prime factor of n(n+1)(n+2)(n+3)(n+4)(n+5). A193947

Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits. A241846

Numerator of [x²ⁿ] of the Taylor series sech(cosec(x)-cot(x)) = 1 -x²/8 -x⁴/128 +x⁶/15360 +19·x⁸/294912 +25031·x¹⁰/3715891200+... . A13528

a(n) = 109·n². A174339

Number of points of norm <= n in the body-centered cubic lattice with the lattice parameter equal to 2/sqrt(3). A276648