638826922 has 4 divisors (see below), whose sum is σ = 958240386. Its totient is φ = 319413460.

The previous prime is 638826913. The next prime is 638826989. The reversal of 638826922 is 229628836.

It is a happy number.

638826922 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 can be written as a sum of positive squares in only one way, i.e., 637007121 + 1819801 = 25239^2 + 1349^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159706729 + ... + 159706732.

Almost surely, 2^638826922 is an apocalyptic number.

638826922 is a deficient number, since it is larger than the sum of its proper divisors (319413464).

638826922 is a wasteful number, since it uses less digits than its factorization.

638826922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319413463.

The product of its digits is 497664, while the sum is 46.

The square root of 638826922 is about 25275.0256577516. The cubic root of 638826922 is about 861.2470290026.

The spelling of 638826922 in words is "six hundred thirty-eight million, eight hundred twenty-six thousand, nine hundred twenty-two".