218323812 has 36 divisors (see below), whose sum is σ = 592594800. Its totient is φ = 62378064.

The previous prime is 218323799. The next prime is 218323823.

218323812 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×218323812² = 95330573772422688, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 218323812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185062 + ... + 186237.

Almost surely, 2^218323812 is an apocalyptic number.

It is an amenable number.

218323812 is an abundant number, since it is smaller than the sum of its proper divisors (374270988).

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

218323812 is a wasteful number, since it uses less digits than its factorization.

218323812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371320 (or 371311 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 218323812 is about 14775.7846492158. The cubic root of 218323812 is about 602.1440073730.

The spelling of 218323812 in words is "two hundred eighteen million, three hundred twenty-three thousand, eight hundred twelve".