138879402 has 16 divisors (see below), whose sum is σ = 277901280. Its totient is φ = 46269392.

The previous prime is 138879353. The next prime is 138879413. The reversal of 138879402 is 204978831.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10048 + ... + 19460.

It is an arithmetic number, because the mean of its divisors is an integer number (17368830).

Almost surely, 2^138879402 is an apocalyptic number.

138879402 is an abundant number, since it is smaller than the sum of its proper divisors (139021878).

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

138879402 is a wasteful number, since it uses less digits than its factorization.

138879402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11877.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 138879402 is about 11784.7105182945. The cubic root of 138879402 is about 517.8602928694.

The spelling of 138879402 in words is "one hundred thirty-eight million, eight hundred seventy-nine thousand, four hundred two".