19938904 has 32 divisors (see below), whose sum is σ = 40204800. Its totient is φ = 9240480.

The previous prime is 19938901. The next prime is 19938911. The reversal of 19938904 is 40983991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938901) by changing a digit.

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, 5749 + ... + 8539.

It is an arithmetic number, because the mean of its divisors is an integer number (1256400).

Almost surely, 2^19938904 is an apocalyptic number.

It is an amenable number.

19938904 is an abundant number, since it is smaller than the sum of its proper divisors (20265896).

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

19938904 is a wasteful number, since it uses less digits than its factorization.

19938904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863 (or 2859 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 19938904 is about 4465.2999899223. The cubic root of 19938904 is about 271.1650796340.

The spelling of 19938904 in words is "nineteen million, nine hundred thirty-eight thousand, nine hundred four".