218055386 has 16 divisors (see below), whose sum is σ = 337603680. Its totient is φ = 105576240.

The previous prime is 218055377. The next prime is 218055491. The reversal of 218055386 is 683550812.

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 in 7 ways as a sum of consecutive naturals, for example, 5885 + ... + 21696.

It is an arithmetic number, because the mean of its divisors is an integer number (21100230).

Almost surely, 2^218055386 is an apocalyptic number.

218055386 is a deficient number, since it is larger than the sum of its proper divisors (119548294).

218055386 is a wasteful number, since it uses less digits than its factorization.

218055386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27709.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 218055386 is about 14766.6985477459. The cubic root of 218055386 is about 601.8971303570.

The spelling of 218055386 in words is "two hundred eighteen million, fifty-five thousand, three hundred eighty-six".