19998208 has 40 divisors (see below), whose sum is σ = 40388040. Its totient is φ = 9891840.

The previous prime is 19998169. The next prime is 19998217. The reversal of 19998208 is 80289991.

It is a happy number.

It is a super-2 number, since 2×19998208² = 799856646422528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71028 + ... + 71308.

It is an arithmetic number, because the mean of its divisors is an integer number (1009701).

Almost surely, 2^19998208 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 19998208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20194020).

19998208 is an abundant number, since it is smaller than the sum of its proper divisors (20389832).

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

19998208 is an equidigital number, since it uses as much as digits as its factorization.

19998208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 19998208 is about 4471.9355988207. The cubic root of 19998208 is about 271.4336543567.

The spelling of 19998208 in words is "nineteen million, nine hundred ninety-eight thousand, two hundred eight".