222218388 has 72 divisors (see below), whose sum is σ = 644804160. Its totient is φ = 63210240.

The previous prime is 222218371. The next prime is 222218417. The reversal of 222218388 is 883812222.

222218388 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58903 + ... + 62561.

Almost surely, 2^222218388 is an apocalyptic number.

222218388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222218388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322402080).

222218388 is an abundant number, since it is smaller than the sum of its proper divisors (422585772).

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

222218388 is a wasteful number, since it uses less digits than its factorization.

222218388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917 (or 3912 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 222218388 is about 14906.9912457209. The cubic root of 222218388 is about 605.7033806353.

The spelling of 222218388 in words is "two hundred twenty-two million, two hundred eighteen thousand, three hundred eighty-eight".