138591942 has 16 divisors (see below), whose sum is σ = 277385472. Its totient is φ = 46163720.

The previous prime is 138591941. The next prime is 138591953. The reversal of 138591942 is 249195831.

138591942 is digitally balanced in base 3, 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 = 138591894 and 138591903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138591941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1423 + ... + 16709.

It is an arithmetic number, because the mean of its divisors is an integer number (17336592).

Almost surely, 2^138591942 is an apocalyptic number.

138591942 is an abundant number, since it is smaller than the sum of its proper divisors (138793530).

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

138591942 is a wasteful number, since it uses less digits than its factorization.

138591942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16803.

The product of its digits is 77760, while the sum is 42.

The square root of 138591942 is about 11772.5078891458. The cubic root of 138591942 is about 517.5027477742.

The spelling of 138591942 in words is "one hundred thirty-eight million, five hundred ninety-one thousand, nine hundred forty-two".