638474914 has 32 divisors (see below), whose sum is σ = 1197960192. Its totient is φ = 247938000.

The previous prime is 638474891. The next prime is 638474939. The reversal of 638474914 is 419474836.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41229 + ... + 54559.

It is an arithmetic number, because the mean of its divisors is an integer number (37436256).

Almost surely, 2^638474914 is an apocalyptic number.

638474914 is a deficient number, since it is larger than the sum of its proper divisors (559485278).

638474914 is a wasteful number, since it uses less digits than its factorization.

638474914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13662.

The product of its digits is 580608, while the sum is 46.

The square root of 638474914 is about 25268.0611444567. The cubic root of 638474914 is about 861.0888111116.

The spelling of 638474914 in words is "six hundred thirty-eight million, four hundred seventy-four thousand, nine hundred fourteen".