138867442 has 16 divisors (see below), whose sum is σ = 239578560. Its totient is φ = 59134608.

The previous prime is 138867433. The next prime is 138867497. The reversal of 138867442 is 244768831.

138867442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29392 + ... + 33787.

It is an arithmetic number, because the mean of its divisors is an integer number (14973660).

Almost surely, 2^138867442 is an apocalyptic number.

138867442 is a deficient number, since it is larger than the sum of its proper divisors (100711118).

138867442 is a wasteful number, since it uses less digits than its factorization.

138867442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63345.

The product of its digits is 258048, while the sum is 43.

The square root of 138867442 is about 11784.2030702123. The cubic root of 138867442 is about 517.8454267653.

The spelling of 138867442 in words is "one hundred thirty-eight million, eight hundred sixty-seven thousand, four hundred forty-two".