19938828 has 144 divisors (see below), whose sum is σ = 62280960. Its totient is φ = 4821120.

The previous prime is 19938827. The next prime is 19938839. The reversal of 19938828 is 82883991.

It is a happy number.

Its product of digits (248832) is a multiple of the sum of its prime factors (108).

It is not an unprimeable number, because it can be changed into a prime (19938827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 643173 + ... + 643203.

Almost surely, 2^19938828 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 19938828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31140480).

19938828 is an abundant number, since it is smaller than the sum of its proper divisors (42342132).

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

19938828 is a wasteful number, since it uses less digits than its factorization.

19938828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 75 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 19938828 is about 4465.2914798476. The cubic root of 19938828 is about 271.1647351053.

The spelling of 19938828 in words is "nineteen million, nine hundred thirty-eight thousand, eight hundred twenty-eight".