19989828 has 60 divisors (see below), whose sum is σ = 52852800. Its totient is φ = 6587568.

The previous prime is 19989817. The next prime is 19989839. The reversal of 19989828 is 82898991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19989817) and next prime (19989839).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33073 + ... + 33671.

It is an arithmetic number, because the mean of its divisors is an integer number (880880).

Almost surely, 2^19989828 is an apocalyptic number.

19989828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19989828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26426400).

19989828 is an abundant number, since it is smaller than the sum of its proper divisors (32862972).

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

19989828 is a wasteful number, since it uses less digits than its factorization.

19989828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 707 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 19989828 is about 4470.9985461863. The cubic root of 19989828 is about 271.3957354290.

The spelling of 19989828 in words is "nineteen million, nine hundred eighty-nine thousand, eight hundred twenty-eight".