638373474 has 20 divisors (see below), whose sum is σ = 1430429814. Its totient is φ = 212791104.

The previous prime is 638373473. The next prime is 638373523. The reversal of 638373474 is 474373836.

638373474 is a `hidden beast` number, since 638 + 3 + 7 + 3 + 4 + 7 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 516425625 + 121947849 = 22725^2 + 11043^2 .

It is not an unprimeable number, because it can be changed into a prime (638373473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1970127 + ... + 1970450.

Almost surely, 2^638373474 is an apocalyptic number.

638373474 is an abundant number, since it is smaller than the sum of its proper divisors (792056340).

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

638373474 is a wasteful number, since it uses less digits than its factorization.

638373474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940591 (or 3940582 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 45.

The square root of 638373474 is about 25266.0537876416. The cubic root of 638373474 is about 861.0432058349.

The spelling of 638373474 in words is "six hundred thirty-eight million, three hundred seventy-three thousand, four hundred seventy-four".