19999798 has 48 divisors (see below), whose sum is σ = 37946880. Its totient is φ = 7738848.

The previous prime is 19999789. The next prime is 19999817. The reversal of 19999798 is 89799991.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 186861 + ... + 186967.

It is an arithmetic number, because the mean of its divisors is an integer number (790560).

Almost surely, 2^19999798 is an apocalyptic number.

19999798 is a deficient number, since it is larger than the sum of its proper divisors (17947082).

19999798 is a wasteful number, since it uses less digits than its factorization.

19999798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 208 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 61.

The square root of 19999798 is about 4472.1133706560. The cubic root of 19999798 is about 271.4408478025.

The spelling of 19999798 in words is "nineteen million, nine hundred ninety-nine thousand, seven hundred ninety-eight".