216285 has 8 divisors (see below), whose sum is σ = 346080. Its totient is φ = 115344.

The previous prime is 216263. The next prime is 216289. The reversal of 216285 is 582612.

216285 = 151² + 152² + ... + 159².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216285 - 2⁷ = 216157 is a prime.

216285 is a lucky number.

It is a plaindrome in base 16.

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 7 ways as a sum of consecutive naturals, for example, 7195 + ... + 7224.

It is an arithmetic number, because the mean of its divisors is an integer number (43260).

2²¹⁶²⁸⁵ is an apocalyptic number.

It is an amenable number.

216285 is a deficient number, since it is larger than the sum of its proper divisors (129795).

216285 is a wasteful number, since it uses less digits than its factorization.

216285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14427.

The product of its digits is 960, while the sum is 24.

The square root of 216285 is about 465.0645116540. The cubic root of 216285 is about 60.0263772912.

Adding to 216285 its reverse (582612), we get a palindrome (798897).

The spelling of 216285 in words is "two hundred sixteen thousand, two hundred eighty-five".