138842242 has 64 divisors (see below), whose sum is σ = 271319040. Its totient is φ = 51710400.

The previous prime is 138842153. The next prime is 138842261. The reversal of 138842242 is 242248831.

It is a junction number, because it is equal to n+sod(n) for n = 138842198 and 138842207.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 606184 + ... + 606412.

It is an arithmetic number, because the mean of its divisors is an integer number (4239360).

Almost surely, 2^138842242 is an apocalyptic number.

138842242 is a deficient number, since it is larger than the sum of its proper divisors (132476798).

138842242 is a wasteful number, since it uses less digits than its factorization.

138842242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its digits is 24576, while the sum is 34.

The square root of 138842242 is about 11783.1337936900. The cubic root of 138842242 is about 517.8141007420.

The spelling of 138842242 in words is "one hundred thirty-eight million, eight hundred forty-two thousand, two hundred forty-two".