19998288 has 60 divisors (see below), whose sum is σ = 56508660. Its totient is φ = 6601728.

The previous prime is 19998263. The next prime is 19998337. The reversal of 19998288 is 88289991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10188864 + 9809424 = 3192^2 + 3132^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15658 + ... + 16886.

It is an arithmetic number, because the mean of its divisors is an integer number (941811).

Almost surely, 2^19998288 is an apocalyptic number.

19998288 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 19998288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28254330).

19998288 is an abundant number, since it is smaller than the sum of its proper divisors (36510372).

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

19998288 is a wasteful number, since it uses less digits than its factorization.

19998288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1347 counting only the distinct ones).

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

The square root of 19998288 is about 4471.9445434844. The cubic root of 19998288 is about 271.4340163002.

The spelling of 19998288 in words is "nineteen million, nine hundred ninety-eight thousand, two hundred eighty-eight".