138879142 has 16 divisors (see below), whose sum is σ = 212102352. Its totient is φ = 68186880.

The previous prime is 138879131. The next prime is 138879157. The reversal of 138879142 is 241978831.

It is a congruent number.

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, 33213 + ... + 37159.

It is an arithmetic number, because the mean of its divisors is an integer number (13256397).

Almost surely, 2^138879142 is an apocalyptic number.

138879142 is a deficient number, since it is larger than the sum of its proper divisors (73223210).

138879142 is a wasteful number, since it uses less digits than its factorization.

138879142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263.

The product of its digits is 96768, while the sum is 43.

The square root of 138879142 is about 11784.6994870468. The cubic root of 138879142 is about 517.8599697023.

The spelling of 138879142 in words is "one hundred thirty-eight million, eight hundred seventy-nine thousand, one hundred forty-two".