19998573 has 8 divisors (see below), whose sum is σ = 30474048. Its totient is φ = 11427744.

The previous prime is 19998571. The next prime is 19998577. The reversal of 19998573 is 37589991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19998573 - 2¹ = 19998571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476136 + ... + 476177.

It is an arithmetic number, because the mean of its divisors is an integer number (3809256).

Almost surely, 2^19998573 is an apocalyptic number.

It is an amenable number.

19998573 is a deficient number, since it is larger than the sum of its proper divisors (10475475).

19998573 is an equidigital number, since it uses as much as digits as its factorization.

19998573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952323.

The product of its digits is 612360, while the sum is 51.

The square root of 19998573 is about 4471.9764087034. The cubic root of 19998573 is about 271.4353057160.

The spelling of 19998573 in words is "nineteen million, nine hundred ninety-eight thousand, five hundred seventy-three".