138877726 has 64 divisors (see below), whose sum is σ = 261273600. Its totient is φ = 54590976.

The previous prime is 138877721. The next prime is 138877733. The reversal of 138877726 is 627778831.

It is a self number, because there is not a number n which added to its sum of digits gives 138877726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138877721) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 192795 + ... + 193513.

It is an arithmetic number, because the mean of its divisors is an integer number (4082400).

Almost surely, 2^138877726 is an apocalyptic number.

138877726 is a deficient number, since it is larger than the sum of its proper divisors (122395874).

138877726 is a wasteful number, since it uses less digits than its factorization.

138877726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793.

The product of its digits is 790272, while the sum is 49.

The square root of 138877726 is about 11784.6394089934. The cubic root of 138877726 is about 517.8582096774.

The spelling of 138877726 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, seven hundred twenty-six".