138395636 has 12 divisors (see below), whose sum is σ = 247345728. Its totient is φ = 67725432.

The previous prime is 138395633. The next prime is 138395671. The reversal of 138395636 is 636593831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138395633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367886 + ... + 368261.

It is an arithmetic number, because the mean of its divisors is an integer number (20612144).

Almost surely, 2^138395636 is an apocalyptic number.

It is an amenable number.

138395636 is a deficient number, since it is larger than the sum of its proper divisors (108950092).

138395636 is a wasteful number, since it uses less digits than its factorization.

138395636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736198 (or 736196 counting only the distinct ones).

The product of its digits is 349920, while the sum is 44.

The square root of 138395636 is about 11764.1674588557. The cubic root of 138395636 is about 517.2582965810.

The spelling of 138395636 in words is "one hundred thirty-eight million, three hundred ninety-five thousand, six hundred thirty-six".