19999928 has 16 divisors (see below), whose sum is σ = 40384680. Its totient is φ = 9230688.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999928 is 82999991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999927) 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 3 ways as a sum of consecutive naturals, for example, 96050 + ... + 96257.

Almost surely, 2^19999928 is an apocalyptic number.

It is an amenable number.

19999928 is an abundant number, since it is smaller than the sum of its proper divisors (20384752).

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

19999928 is a wasteful number, since it uses less digits than its factorization.

19999928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192326 (or 192322 counting only the distinct ones).

The product of its digits is 944784, while the sum is 56.

The square root of 19999928 is about 4472.1279051476. The cubic root of 19999928 is about 271.4414359290.

The spelling of 19999928 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred twenty-eight".