19921128 has 64 divisors (see below), whose sum is σ = 52531200. Its totient is φ = 6283200.

The previous prime is 19921067. The next prime is 19921129. The reversal of 19921128 is 82112991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83233 + ... + 83471.

It is an arithmetic number, because the mean of its divisors is an integer number (820800).

Almost surely, 2^19921128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19921128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26265600).

19921128 is an abundant number, since it is smaller than the sum of its proper divisors (32610072).

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

19921128 is a wasteful number, since it uses less digits than its factorization.

19921128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 418 counting only the distinct ones).

The product of its digits is 2592, while the sum is 33.

The square root of 19921128 is about 4463.3090863170. The cubic root of 19921128 is about 271.0844723346.

The spelling of 19921128 in words is "nineteen million, nine hundred twenty-one thousand, one hundred twenty-eight".