138819738 has 32 divisors (see below), whose sum is σ = 299059200. Its totient is φ = 42816816.

The previous prime is 138819649. The next prime is 138819749. The reversal of 138819738 is 837918831.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 9258 + ... + 19061.

It is an arithmetic number, because the mean of its divisors is an integer number (9345600).

Almost surely, 2^138819738 is an apocalyptic number.

138819738 is an abundant number, since it is smaller than the sum of its proper divisors (160239462).

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

138819738 is a wasteful number, since it uses less digits than its factorization.

138819738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28386.

The product of its digits is 290304, while the sum is 48.

The square root of 138819738 is about 11782.1788307596. The cubic root of 138819738 is about 517.7861229018.

The spelling of 138819738 in words is "one hundred thirty-eight million, eight hundred nineteen thousand, seven hundred thirty-eight".