188138608 has 40 divisors (see below), whose sum is σ = 438523520. Its totient is φ = 76386240.

The previous prime is 188138591. The next prime is 188138611. The reversal of 188138608 is 806831881.

It is a super-2 number, since 2×188138608² = 70792271640355328, 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 7 ways as a sum of consecutive naturals, for example, 42078 + ... + 46333.

It is an arithmetic number, because the mean of its divisors is an integer number (10963088).

Almost surely, 2^188138608 is an apocalyptic number.

It is an amenable number.

188138608 is an abundant number, since it is smaller than the sum of its proper divisors (250384912).

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

188138608 is a wasteful number, since it uses less digits than its factorization.

188138608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88445 (or 88439 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 188138608 is about 13716.3627831871. The cubic root of 188138608 is about 573.0061837712.

The spelling of 188138608 in words is "one hundred eighty-eight million, one hundred thirty-eight thousand, six hundred eight".