19688404 has 6 divisors (see below), whose sum is σ = 34454714. Its totient is φ = 9844200.

The previous prime is 19688399. The next prime is 19688411. The reversal of 19688404 is 40488691.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 63504 = 4430^2 + 252^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2461047 + ... + 2461054.

Almost surely, 2^19688404 is an apocalyptic number.

It is an amenable number.

19688404 is a deficient number, since it is larger than the sum of its proper divisors (14766310).

19688404 is a wasteful number, since it uses less digits than its factorization.

19688404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922105 (or 4922103 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 19688404 is about 4437.1617054148. The cubic root of 19688404 is about 270.0247073869.

The spelling of 19688404 in words is "nineteen million, six hundred eighty-eight thousand, four hundred four".