216308 has 12 divisors (see below), whose sum is σ = 400932. Its totient is φ = 101760.

The previous prime is 216289. The next prime is 216317. The reversal of 216308 is 803612.

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 131044 = 292^2 + 362^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (33411).

2²¹⁶³⁰⁸ is an apocalyptic number.

It is an amenable number.

216308 is a deficient number, since it is larger than the sum of its proper divisors (184624).

216308 is a wasteful number, since it uses less digits than its factorization.

216308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202 (or 3200 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 216308 is about 465.0892387489. The cubic root of 216308 is about 60.0285049741.

The spelling of 216308 in words is "two hundred sixteen thousand, three hundred eight".