138234942 has 12 divisors (see below), whose sum is σ = 299509080. Its totient is φ = 46078308.

The previous prime is 138234931. The next prime is 138234947. The reversal of 138234942 is 249432831.

138234942 is digitally balanced in base 2, because in such base 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 = 138234897 and 138234906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138234947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3839842 + ... + 3839877.

It is an arithmetic number, because the mean of its divisors is an integer number (24959090).

Almost surely, 2^138234942 is an apocalyptic number.

138234942 is an abundant number, since it is smaller than the sum of its proper divisors (161274138).

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

138234942 is a wasteful number, since it uses less digits than its factorization.

138234942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7679727 (or 7679724 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 138234942 is about 11757.3356675737. The cubic root of 138234942 is about 517.0580193209.

The spelling of 138234942 in words is "one hundred thirty-eight million, two hundred thirty-four thousand, nine hundred forty-two".