138395768 has 32 divisors (see below), whose sum is σ = 297444960. Its totient is φ = 59136000.

The previous prime is 138395729. The next prime is 138395783. The reversal of 138395768 is 867593831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16268 + ... + 23268.

It is an arithmetic number, because the mean of its divisors is an integer number (9295155).

Almost surely, 2^138395768 is an apocalyptic number.

It is an amenable number.

138395768 is an abundant number, since it is smaller than the sum of its proper divisors (159049192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138395768 is a wasteful number, since it uses less digits than its factorization.

138395768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367 (or 7363 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The square root of 138395768 is about 11764.1730691111. The cubic root of 138395768 is about 517.2584610324.

The spelling of 138395768 in words is "one hundred thirty-eight million, three hundred ninety-five thousand, seven hundred sixty-eight".