218398216 has 32 divisors (see below), whose sum is σ = 415863000. Its totient is φ = 107513856.

The previous prime is 218398211. The next prime is 218398241. The reversal of 218398216 is 612893812.

218398216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 211586116 + 6812100 = 14546^2 + 2610^2 .

It is not an unprimeable number, because it can be changed into a prime (218398211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177090 + ... + 178318.

Almost surely, 2^218398216 is an apocalyptic number.

It is an amenable number.

218398216 is a deficient number, since it is larger than the sum of its proper divisors (197464784).

218398216 is a wasteful number, since it uses less digits than its factorization.

218398216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1557 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 218398216 is about 14778.3022028919. The cubic root of 218398216 is about 602.2124024690.

The spelling of 218398216 in words is "two hundred eighteen million, three hundred ninety-eight thousand, two hundred sixteen".