138877636 has 12 divisors (see below), whose sum is σ = 251416620. Its totient is φ = 67044320.

The previous prime is 138877597. The next prime is 138877637. The reversal of 138877636 is 636778831.

It can be written as a sum of positive squares in 2 ways, for example, as 32993536 + 105884100 = 5744^2 + 10290^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138877636.

It is not an unprimeable number, because it can be changed into a prime (138877637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598495 + ... + 598726.

It is an arithmetic number, because the mean of its divisors is an integer number (20951385).

Almost surely, 2^138877636 is an apocalyptic number.

It is an amenable number.

138877636 is a deficient number, since it is larger than the sum of its proper divisors (112538984).

138877636 is a wasteful number, since it uses less digits than its factorization.

138877636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197254 (or 1197252 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 49.

The square root of 138877636 is about 11784.6355904627. The cubic root of 138877636 is about 517.8580978110.

The spelling of 138877636 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred thirty-six".