138042934 has 4 divisors (see below), whose sum is σ = 207064404. Its totient is φ = 69021466.

The previous prime is 138042913. The next prime is 138042937. The reversal of 138042934 is 439240831.

138042934 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 138042934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138042937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34510732 + ... + 34510735.

It is an arithmetic number, because the mean of its divisors is an integer number (51766101).

Almost surely, 2^138042934 is an apocalyptic number.

138042934 is a deficient number, since it is larger than the sum of its proper divisors (69021470).

138042934 is an equidigital number, since it uses as much as digits as its factorization.

138042934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69021469.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 138042934 is about 11749.1673747547. The cubic root of 138042934 is about 516.8185109485.

The spelling of 138042934 in words is "one hundred thirty-eight million, forty-two thousand, nine hundred thirty-four".