638375829 has 32 divisors (see below), whose sum is σ = 1049314560. Its totient is φ = 336172032.

The previous prime is 638375827. The next prime is 638375861. The reversal of 638375829 is 928573836.

638375829 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 638375829 - 2¹ = 638375827 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638375827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205117 + ... + 208205.

It is an arithmetic number, because the mean of its divisors is an integer number (32791080).

Almost surely, 2^638375829 is an apocalyptic number.

It is an amenable number.

638375829 is a deficient number, since it is larger than the sum of its proper divisors (410938731).

638375829 is a wasteful number, since it uses less digits than its factorization.

638375829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869.

The product of its digits is 2177280, while the sum is 51.

The square root of 638375829 is about 25266.1003916315. The cubic root of 638375829 is about 861.0442646478.

The spelling of 638375829 in words is "six hundred thirty-eight million, three hundred seventy-five thousand, eight hundred twenty-nine".