19989228 has 24 divisors (see below), whose sum is σ = 53304832. Its totient is φ = 5711184.

The previous prime is 19989227. The next prime is 19989239. The reversal of 19989228 is 82298991.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19989223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118900 + ... + 119067.

Almost surely, 2^19989228 is an apocalyptic number.

It is an amenable number.

19989228 is an abundant number, since it is smaller than the sum of its proper divisors (33315604).

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

19989228 is a wasteful number, since it uses less digits than its factorization.

19989228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237981 (or 237979 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 19989228 is about 4470.9314465780. The cubic root of 19989228 is about 271.3930200634.

The spelling of 19989228 in words is "nineteen million, nine hundred eighty-nine thousand, two hundred twenty-eight".