Properties of the Number 40185

Forty Thousand One Hundred Eighty-Five

Basics

Value: 40184 → 40185 → 40186

Parity: odd

Prime: No

Previous Prime: 40177

Next Prime: 40189

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 19 × 47

Divisors: 1, 3, 5, 9, 15, 19, 45, 47, 57, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001110011111001

Octal: 116371

Duodecimal: 1B309

Hexadecimal: 9cf9

Square: 1614834225

Square Root: 200.46196646745736

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

G.f. A(x) satisfies A(x) = 1 + x + x*(1 + x)⁴*A(x)³. A366241

a(1) = 1, a(2) = 2, next terms up to a(2n-1) are obtained by multiplying previous terms a(n-1) by n+1, a(n-2) by n+2 etc. a(2) by (2n-2) and a(1) by 2n-1. On similar lines a(2n) = 2n·a(2n-2), a(2n+1) = (2n+1)*a(2n-1) and so on. A109844

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero. A317378

Squares where A323811 gets stuck. A323815

Least k such that ((k+2)/(k-2))^k - e⁴ < 1/n. A248111

Continued fraction for sqrt(200). A40185