138385042 has 16 divisors (see below), whose sum is σ = 216437760. Its totient is φ = 66277008.

The previous prime is 138385033. The next prime is 138385073. The reversal of 138385042 is 240583831.

It is a happy number.

138385042 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 a junction number, because it is equal to n+sod(n) for n = 138384989 and 138385007.

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, 2028 + ... + 16759.

It is an arithmetic number, because the mean of its divisors is an integer number (13527360).

Almost surely, 2^138385042 is an apocalyptic number.

138385042 is a deficient number, since it is larger than the sum of its proper divisors (78052718).

138385042 is a wasteful number, since it uses less digits than its factorization.

138385042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18945.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 138385042 is about 11763.7171846317. The cubic root of 138385042 is about 517.2450977683.

The spelling of 138385042 in words is "one hundred thirty-eight million, three hundred eighty-five thousand, forty-two".