638372211 has 8 divisors (see below), whose sum is σ = 874167504. Its totient is φ = 414079200.

The previous prime is 638372201. The next prime is 638372213. The reversal of 638372211 is 112273836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638372211 - 2²⁵ = 604817779 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (638372213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2875440 + ... + 2875661.

It is an arithmetic number, because the mean of its divisors is an integer number (109270938).

Almost surely, 2^638372211 is an apocalyptic number.

638372211 is a deficient number, since it is larger than the sum of its proper divisors (235795293).

638372211 is a wasteful number, since it uses less digits than its factorization.

638372211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5751141.

The product of its digits is 12096, while the sum is 33.

The square root of 638372211 is about 25266.0287936193. The cubic root of 638372211 is about 861.0426379863.

The spelling of 638372211 in words is "six hundred thirty-eight million, three hundred seventy-two thousand, two hundred eleven".