138385242 has 24 divisors (see below), whose sum is σ = 300119040. Its totient is φ = 46084680.

The previous prime is 138385237. The next prime is 138385243. The reversal of 138385242 is 242583831.

138385242 is a `hidden beast` number, since 1 + 38 + 385 + 242 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 138385197 and 138385206.

It is not an unprimeable number, because it can be changed into a prime (138385243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20017 + ... + 26027.

It is an arithmetic number, because the mean of its divisors is an integer number (12504960).

Almost surely, 2^138385242 is an apocalyptic number.

138385242 is an abundant number, since it is smaller than the sum of its proper divisors (161733798).

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

138385242 is a wasteful number, since it uses less digits than its factorization.

138385242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298 (or 7295 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 138385242 is about 11763.7256853431. The cubic root of 138385242 is about 517.2453469498.

The spelling of 138385242 in words is "one hundred thirty-eight million, three hundred eighty-five thousand, two hundred forty-two".