138658888 has 16 divisors (see below), whose sum is σ = 260914860. Its totient is φ = 69081600.

The previous prime is 138658859. The next prime is 138658937. The reversal of 138658888 is 888856831.

It is a happy number.

138658888 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 2 ways, for example, as 130919364 + 7739524 = 11442^2 + 2782^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28593 + ... + 33088.

Almost surely, 2^138658888 is an apocalyptic number.

It is an amenable number.

138658888 is a deficient number, since it is larger than the sum of its proper divisors (122255972).

138658888 is a wasteful number, since it uses less digits than its factorization.

138658888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61968 (or 61964 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 55.

The square root of 138658888 is about 11775.3508652609. The cubic root of 138658888 is about 517.5860598861.

The spelling of 138658888 in words is "one hundred thirty-eight million, six hundred fifty-eight thousand, eight hundred eighty-eight".