638211199 has 4 divisors (see below), whose sum is σ = 665959536. Its totient is φ = 610462864.

The previous prime is 638211193. The next prime is 638211221. The reversal of 638211199 is 991112836.

638211199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638211199 - 2³ = 638211191 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638211191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13874134 + ... + 13874179.

It is an arithmetic number, because the mean of its divisors is an integer number (166489884).

Almost surely, 2^638211199 is an apocalyptic number.

638211199 is a deficient number, since it is larger than the sum of its proper divisors (27748337).

638211199 is a wasteful number, since it uses less digits than its factorization.

638211199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27748336.

The product of its digits is 23328, while the sum is 40.

The square root of 638211199 is about 25262.8422589383. The cubic root of 638211199 is about 860.9702403828.

The spelling of 638211199 in words is "six hundred thirty-eight million, two hundred eleven thousand, one hundred ninety-nine".