138935868 has 24 divisors (see below), whose sum is σ = 335363280. Its totient is φ = 44714880.

The previous prime is 138935861. The next prime is 138935879. The reversal of 138935868 is 868539831.

It is a self number, because there is not a number n which added to its sum of digits gives 138935868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138935861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199273 + ... + 199968.

It is an arithmetic number, because the mean of its divisors is an integer number (13973470).

Almost surely, 2^138935868 is an apocalyptic number.

It is an amenable number.

138935868 is an abundant number, since it is smaller than the sum of its proper divisors (196427412).

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

138935868 is a wasteful number, since it uses less digits than its factorization.

138935868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399277 (or 399275 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 51.

The square root of 138935868 is about 11787.1060061408. The cubic root of 138935868 is about 517.9304677519.

The spelling of 138935868 in words is "one hundred thirty-eight million, nine hundred thirty-five thousand, eight hundred sixty-eight".