138013868 has 6 divisors (see below), whose sum is σ = 241524276. Its totient is φ = 69006932.

The previous prime is 138013867. The next prime is 138013879. The reversal of 138013868 is 868310831.

138013868 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138013867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17251730 + ... + 17251737.

It is an arithmetic number, because the mean of its divisors is an integer number (40254046).

Almost surely, 2^138013868 is an apocalyptic number.

It is an amenable number.

138013868 is a deficient number, since it is larger than the sum of its proper divisors (103510408).

138013868 is a wasteful number, since it uses less digits than its factorization.

138013868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34503471 (or 34503469 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 138013868 is about 11747.9303709207. The cubic root of 138013868 is about 516.7822350333.

The spelling of 138013868 in words is "one hundred thirty-eight million, thirteen thousand, eight hundred sixty-eight".