218612404 has 12 divisors (see below), whose sum is σ = 402707200. Its totient is φ = 103553208.

The previous prime is 218612323. The next prime is 218612441. The reversal of 218612404 is 404216812.

218612404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1438164 + ... + 1438315.

Almost surely, 2^218612404 is an apocalyptic number.

It is an amenable number.

218612404 is a deficient number, since it is larger than the sum of its proper divisors (184094796).

218612404 is a wasteful number, since it uses less digits than its factorization.

218612404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876502 (or 2876500 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 218612404 is about 14785.5471322505. The cubic root of 218612404 is about 602.4092058566.

The spelling of 218612404 in words is "two hundred eighteen million, six hundred twelve thousand, four hundred four".