138673178 has 16 divisors (see below), whose sum is σ = 237894144. Its totient is φ = 59389200.

The previous prime is 138673169. The next prime is 138673207. The reversal of 138673178 is 871376831.

It is a Smith number, since the sum of its digits (44) 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24776 + ... + 29852.

It is an arithmetic number, because the mean of its divisors is an integer number (14868384).

Almost surely, 2^138673178 is an apocalyptic number.

138673178 is a deficient number, since it is larger than the sum of its proper divisors (99220966).

138673178 is a wasteful number, since it uses less digits than its factorization.

138673178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037.

The product of its digits is 169344, while the sum is 44.

The square root of 138673178 is about 11775.9576256031. The cubic root of 138673178 is about 517.6038398515.

The spelling of 138673178 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, one hundred seventy-eight".