638974812 has 24 divisors (see below), whose sum is σ = 1703933056. Its totient is φ = 182564208.

The previous prime is 638974781. The next prime is 638974813. The reversal of 638974812 is 218479836.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638974813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3803338 + ... + 3803505.

Almost surely, 2^638974812 is an apocalyptic number.

It is an amenable number.

638974812 is an abundant number, since it is smaller than the sum of its proper divisors (1064958244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638974812 is a wasteful number, since it uses less digits than its factorization.

638974812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606857 (or 7606855 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 638974812 is about 25277.9511036793. The cubic root of 638974812 is about 861.3134841415.

The spelling of 638974812 in words is "six hundred thirty-eight million, nine hundred seventy-four thousand, eight hundred twelve".