218338855 has 12 divisors (see below), whose sum is σ = 304783560. Its totient is φ = 149717904.

The previous prime is 218338849. The next prime is 218338867. The reversal of 218338855 is 558833812.

It is not a de Polignac number, because 218338855 - 2³ = 218338847 is a prime.

It is a super-2 number, since 2×218338855² = 95343711205422050, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 445345 + ... + 445834.

It is an arithmetic number, because the mean of its divisors is an integer number (25398630).

Almost surely, 2^218338855 is an apocalyptic number.

218338855 is a deficient number, since it is larger than the sum of its proper divisors (86444705).

218338855 is an equidigital number, since it uses as much as digits as its factorization.

218338855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891198 (or 891191 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 218338855 is about 14776.2936827880. The cubic root of 218338855 is about 602.1578367459.

The spelling of 218338855 in words is "two hundred eighteen million, three hundred thirty-eight thousand, eight hundred fifty-five".