218228394 has 16 divisors (see below), whose sum is σ = 437755968. Its totient is φ = 72526272.

The previous prime is 218228383. The next prime is 218228407. The reversal of 218228394 is 493822812.

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 7 ways as a sum of consecutive naturals, for example, 51942 + ... + 55985.

It is an arithmetic number, because the mean of its divisors is an integer number (27359748).

Almost surely, 2^218228394 is an apocalyptic number.

218228394 is an abundant number, since it is smaller than the sum of its proper divisors (219527574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218228394 is a wasteful number, since it uses less digits than its factorization.

218228394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108269.

The product of its digits is 55296, while the sum is 39.

The square root of 218228394 is about 14772.5554322873. Note that the first 3 decimals coincide. The cubic root of 218228394 is about 602.0562726321.

The spelling of 218228394 in words is "two hundred eighteen million, two hundred twenty-eight thousand, three hundred ninety-four".