19919408 has 20 divisors (see below), whose sum is σ = 38674608. Its totient is φ = 9938880.

The previous prime is 19919401. The next prime is 19919413. The reversal of 19919408 is 80491991.

It is not an unprimeable number, because it can be changed into a prime (19919401) 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 3 ways as a sum of consecutive naturals, for example, 9110 + ... + 11082.

Almost surely, 2^19919408 is an apocalyptic number.

It is an amenable number.

19919408 is a deficient number, since it is larger than the sum of its proper divisors (18755200).

19919408 is a wasteful number, since it uses less digits than its factorization.

19919408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612 (or 2606 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 19919408 is about 4463.1164000057. The cubic root of 19919408 is about 271.0766702544.

The spelling of 19919408 in words is "nineteen million, nine hundred nineteen thousand, four hundred eight".