138632442 has 16 divisors (see below), whose sum is σ = 298593120. Its totient is φ = 42656112.

The previous prime is 138632423. The next prime is 138632449. The reversal of 138632442 is 244236831.

138632442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138632449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 888592 + ... + 888747.

It is an arithmetic number, because the mean of its divisors is an integer number (18662070).

Almost surely, 2^138632442 is an apocalyptic number.

138632442 is an abundant number, since it is smaller than the sum of its proper divisors (159960678).

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

138632442 is a wasteful number, since it uses less digits than its factorization.

138632442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777357.

The product of its digits is 27648, while the sum is 33.

The square root of 138632442 is about 11774.2278727737. The cubic root of 138632442 is about 517.5531519072.

The spelling of 138632442 in words is "one hundred thirty-eight million, six hundred thirty-two thousand, four hundred forty-two".