218318312 has 16 divisors (see below), whose sum is σ = 412473600. Its totient is φ = 108325360.

The previous prime is 218318279. The next prime is 218318327. The reversal of 218318312 is 213813812.

218318312 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 103112 + ... + 105207.

It is an arithmetic number, because the mean of its divisors is an integer number (25779600).

Almost surely, 2^218318312 is an apocalyptic number.

It is an amenable number.

218318312 is a deficient number, since it is larger than the sum of its proper divisors (194155288).

218318312 is a wasteful number, since it uses less digits than its factorization.

218318312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208456 (or 208452 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 218318312 is about 14775.5985327160. The cubic root of 218318312 is about 602.1389509389.

The spelling of 218318312 in words is "two hundred eighteen million, three hundred eighteen thousand, three hundred twelve".