218055388 has 6 divisors (see below), whose sum is σ = 381596936. Its totient is φ = 109027692.

The previous prime is 218055377. The next prime is 218055491. The reversal of 218055388 is 883550812.

218055388 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 218055388.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27256920 + ... + 27256927.

Almost surely, 2^218055388 is an apocalyptic number.

It is an amenable number.

218055388 is a deficient number, since it is larger than the sum of its proper divisors (163541548).

218055388 is a wasteful number, since it uses less digits than its factorization.

218055388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54513851 (or 54513849 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 218055388 is about 14766.6986154658. The cubic root of 218055388 is about 601.8971321972.

The spelling of 218055388 in words is "two hundred eighteen million, fifty-five thousand, three hundred eighty-eight".