19729128 has 32 divisors (see below), whose sum is σ = 50162400. Its totient is φ = 6464448.

The previous prime is 19729117. The next prime is 19729141. The reversal of 19729128 is 82192791.

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, 5551 + ... + 8382.

It is an arithmetic number, because the mean of its divisors is an integer number (1567575).

Almost surely, 2^19729128 is an apocalyptic number.

It is an amenable number.

19729128 is an abundant number, since it is smaller than the sum of its proper divisors (30433272).

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

19729128 is a wasteful number, since it uses less digits than its factorization.

19729128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14001 (or 13997 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 19729128 is about 4441.7483044405. The cubic root of 19729128 is about 270.2107545153.

The spelling of 19729128 in words is "nineteen million, seven hundred twenty-nine thousand, one hundred twenty-eight".