188218868 has 6 divisors (see below), whose sum is σ = 329383026. Its totient is φ = 94109432.

The previous prime is 188218861. The next prime is 188218969. The reversal of 188218868 is 868812881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 188183524 + 35344 = 13718^2 + 188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188218861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23527355 + ... + 23527362.

It is an arithmetic number, because the mean of its divisors is an integer number (54897171).

Almost surely, 2^188218868 is an apocalyptic number.

It is an amenable number.

188218868 is a deficient number, since it is larger than the sum of its proper divisors (141164158).

188218868 is a wasteful number, since it uses less digits than its factorization.

188218868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47054721 (or 47054719 counting only the distinct ones).

The product of its digits is 393216, while the sum is 50.

The square root of 188218868 is about 13719.2881739542. The cubic root of 188218868 is about 573.0876537375.

The spelling of 188218868 in words is "one hundred eighty-eight million, two hundred eighteen thousand, eight hundred sixty-eight".