19998168 has 64 divisors (see below), whose sum is σ = 52704000. Its totient is φ = 6314112.

The previous prime is 19998163. The next prime is 19998169. The reversal of 19998168 is 86189991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19998168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998161) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 40821 + ... + 41307.

It is an arithmetic number, because the mean of its divisors is an integer number (823500).

Almost surely, 2^19998168 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 19998168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26352000).

19998168 is an abundant number, since it is smaller than the sum of its proper divisors (32705832).

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

19998168 is a wasteful number, since it uses less digits than its factorization.

19998168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 580 counting only the distinct ones).

The product of its digits is 279936, while the sum is 51.

The square root of 19998168 is about 4471.9311264822. The cubic root of 19998168 is about 271.4334733846.

The spelling of 19998168 in words is "nineteen million, nine hundred ninety-eight thousand, one hundred sixty-eight".