19638472 has 32 divisors (see below), whose sum is σ = 42419520. Its totient is φ = 8349120.

The previous prime is 19638439. The next prime is 19638497. The reversal of 19638472 is 27483691.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5998 + ... + 8674.

It is an arithmetic number, because the mean of its divisors is an integer number (1325610).

Almost surely, 2^19638472 is an apocalyptic number.

It is an amenable number.

19638472 is an abundant number, since it is smaller than the sum of its proper divisors (22781048).

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

19638472 is a wasteful number, since it uses less digits than its factorization.

19638472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821 (or 2817 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 19638472 is about 4431.5315636922. The cubic root of 19638472 is about 269.7962431633.

The spelling of 19638472 in words is "nineteen million, six hundred thirty-eight thousand, four hundred seventy-two".