19998385 has 16 divisors (see below), whose sum is σ = 27319680. Its totient is φ = 13911040.

The previous prime is 19998383. The next prime is 19998403. The reversal of 19998385 is 58389991.

It is not a de Polignac number, because 19998385 - 2¹ = 19998383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19998383) 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, 6640 + ... + 9169.

It is an arithmetic number, because the mean of its divisors is an integer number (1707480).

Almost surely, 2^19998385 is an apocalyptic number.

It is an amenable number.

19998385 is a deficient number, since it is larger than the sum of its proper divisors (7321295).

19998385 is a wasteful number, since it uses less digits than its factorization.

19998385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15848.

The product of its digits is 699840, while the sum is 52.

The square root of 19998385 is about 4471.9553888651. The cubic root of 19998385 is about 271.4344551554.

The spelling of 19998385 in words is "nineteen million, nine hundred ninety-eight thousand, three hundred eighty-five".