Properties of the Number 81240

Eighty-One Thousand Two Hundred Forty

Basics

Value: 81239 → 81240 → 81241

Parity: even

Prime: No

Previous Prime: 81239

Next Prime: 81281

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ³ × 3 × 5 × 677

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110101011000

Octal: 236530

Duodecimal: 3B020

Hexadecimal: 13d58

Square: 6599937600

Square Root: 285.0263145746371

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

a(n) = [ 3rd elementary symmetric function of {log(k)} ], k = 2,3,...,n. A25203

a(n) = 225·n² + 15. A158557

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 38. A31716

a(n) = #{(i,j): μ(i)*μ(j) = 1, 1<=i,j<=n}, where μ = A008683 (Moebius function). A81240