138638195 has 12 divisors (see below), whose sum is σ = 169581216. Its totient is φ = 108806880.

The previous prime is 138638191. The next prime is 138638197. The reversal of 138638195 is 591836831.

138638195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138638195 - 2² = 138638191 is a prime.

It is a super-2 number, since 2×138638195² = 38441098225716050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138638191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9110 + ... + 18980.

It is an arithmetic number, because the mean of its divisors is an integer number (14131768).

Almost surely, 2^138638195 is an apocalyptic number.

138638195 is a deficient number, since it is larger than the sum of its proper divisors (30943021).

138638195 is an frugal number, since it uses more digits than its factorization.

138638195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9982 (or 9929 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 138638195 is about 11774.4721750064. The cubic root of 138638195 is about 517.5603109869.

The spelling of 138638195 in words is "one hundred thirty-eight million, six hundred thirty-eight thousand, one hundred ninety-five".