216508 has 12 divisors (see below), whose sum is σ = 383040. Its totient is φ = 107072.

The previous prime is 216493. The next prime is 216509. The reversal of 216508 is 805612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216509) 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 3 ways as a sum of consecutive naturals, for example, 213 + ... + 691.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2²¹⁶⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

216508 is a deficient number, since it is larger than the sum of its proper divisors (166532).

216508 is a wasteful number, since it uses less digits than its factorization.

216508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 216508 is about 465.3042015714. The cubic root of 216508 is about 60.0470002104.

The spelling of 216508 in words is "two hundred sixteen thousand, five hundred eight".