138195042 has 16 divisors (see below), whose sum is σ = 276892992. Its totient is φ = 45981200.

The previous prime is 138195019. The next prime is 138195047. The reversal of 138195042 is 240591831.

It is a junction number, because it is equal to n+sod(n) for n = 138194994 and 138195012.

It is not an unprimeable number, because it can be changed into a prime (138195047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17334 + ... + 24017.

It is an arithmetic number, because the mean of its divisors is an integer number (17305812).

Almost surely, 2^138195042 is an apocalyptic number.

138195042 is an abundant number, since it is smaller than the sum of its proper divisors (138697950).

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

138195042 is a wasteful number, since it uses less digits than its factorization.

138195042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41913.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 138195042 is about 11755.6387321149. The cubic root of 138195042 is about 517.0082668248.

The spelling of 138195042 in words is "one hundred thirty-eight million, one hundred ninety-five thousand, forty-two".