138216442 has 16 divisors (see below), whose sum is σ = 255169152. Its totient is φ = 54678960.

The previous prime is 138216439. The next prime is 138216473. The reversal of 138216442 is 244612831.

138216442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379534 + ... + 379897.

It is an arithmetic number, because the mean of its divisors is an integer number (15948072).

Almost surely, 2^138216442 is an apocalyptic number.

138216442 is a deficient number, since it is larger than the sum of its proper divisors (116952710).

138216442 is a wasteful number, since it uses less digits than its factorization.

138216442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759453.

The product of its digits is 9216, while the sum is 31.

The square root of 138216442 is about 11756.5488983800. The cubic root of 138216442 is about 517.0349523115.

The spelling of 138216442 in words is "one hundred thirty-eight million, two hundred sixteen thousand, four hundred forty-two".