216318 has 16 divisors (see below), whose sum is σ = 446976. Its totient is φ = 69720.

The previous prime is 216317. The next prime is 216319. The reversal of 216318 is 813612.

It is an interprime number because it is at equal distance from previous prime (216317) and next prime (216319).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216294 and 216303.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216318.

It is not an unprimeable number, because it can be changed into a prime (216317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396 + ... + 767.

It is an arithmetic number, because the mean of its divisors is an integer number (27936).

2²¹⁶³¹⁸ is an apocalyptic number.

216318 is an abundant number, since it is smaller than the sum of its proper divisors (230658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216318 is a wasteful number, since it uses less digits than its factorization.

216318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199.

The product of its digits is 288, while the sum is 21.

The square root of 216318 is about 465.0999892496. The cubic root of 216318 is about 60.0294300067.

The spelling of 216318 in words is "two hundred sixteen thousand, three hundred eighteen".