216286 has 12 divisors (see below), whose sum is σ = 377568. Its totient is φ = 92652.

The previous prime is 216263. The next prime is 216289. The reversal of 216286 is 682612.

It is a super-3 number, since 3×216286³ = 30353339625604968, which contains 333 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 216286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1006 + ... + 1201.

It is an arithmetic number, because the mean of its divisors is an integer number (31464).

2²¹⁶²⁸⁶ is an apocalyptic number.

216286 is a deficient number, since it is larger than the sum of its proper divisors (161282).

216286 is a wasteful number, since it uses less digits than its factorization.

216286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223 (or 2216 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 216286 is about 465.0655867724. The cubic root of 216286 is about 60.0264698023.

Adding to 216286 its reverse (682612), we get a palindrome (898898).

It can be divided in two parts, 216 and 286, that multiplied together give a triangular number (61776 = T₃₅₁).

The spelling of 216286 in words is "two hundred sixteen thousand, two hundred eighty-six".