138739868 has 6 divisors (see below), whose sum is σ = 242794776. Its totient is φ = 69369932.

The previous prime is 138739837. The next prime is 138739877. The reversal of 138739868 is 868937831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17342480 + ... + 17342487.

It is an arithmetic number, because the mean of its divisors is an integer number (40465796).

Almost surely, 2^138739868 is an apocalyptic number.

It is an amenable number.

138739868 is a deficient number, since it is larger than the sum of its proper divisors (104054908).

138739868 is a wasteful number, since it uses less digits than its factorization.

138739868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34684971 (or 34684969 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 138739868 is about 11778.7889020901. The cubic root of 138739868 is about 517.6868010232.

The spelling of 138739868 in words is "one hundred thirty-eight million, seven hundred thirty-nine thousand, eight hundred sixty-eight".