138399898 has 32 divisors (see below), whose sum is σ = 256443264. Its totient is φ = 54551232.

The previous prime is 138399889. The next prime is 138399917. The reversal of 138399898 is 898993831.

138399898 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 15 ways as a sum of consecutive naturals, for example, 54636 + ... + 57112.

It is an arithmetic number, because the mean of its divisors is an integer number (8013852).

Almost surely, 2^138399898 is an apocalyptic number.

138399898 is a deficient number, since it is larger than the sum of its proper divisors (118043366).

138399898 is a wasteful number, since it uses less digits than its factorization.

138399898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806.

The product of its digits is 3359232, while the sum is 58.

The square root of 138399898 is about 11764.3486007513. The cubic root of 138399898 is about 517.2636063154.

The spelling of 138399898 in words is "one hundred thirty-eight million, three hundred ninety-nine thousand, eight hundred ninety-eight".