638964922 has 8 divisors (see below), whose sum is σ = 960201216. Its totient is φ = 318897852.

The previous prime is 638964919. The next prime is 638964923. The reversal of 638964922 is 229469836.

It is a happy number.

638964922 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (638964923) 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, 290938 + ... + 293125.

It is an arithmetic number, because the mean of its divisors is an integer number (120025152).

Almost surely, 2^638964922 is an apocalyptic number.

638964922 is a deficient number, since it is larger than the sum of its proper divisors (321236294).

638964922 is a wasteful number, since it uses less digits than its factorization.

638964922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584612.

The product of its digits is 1119744, while the sum is 49.

The square root of 638964922 is about 25277.7554778900. The cubic root of 638964922 is about 861.3090403387.

The spelling of 638964922 in words is "six hundred thirty-eight million, nine hundred sixty-four thousand, nine hundred twenty-two".