19998598 has 4 divisors (see below), whose sum is σ = 29997900. Its totient is φ = 9999298.

The previous prime is 19998593. The next prime is 19998599. The reversal of 19998598 is 89589991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998593) 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 as a sum of consecutive naturals, namely, 4999648 + ... + 4999651.

It is an arithmetic number, because the mean of its divisors is an integer number (7499475).

Almost surely, 2^19998598 is an apocalyptic number.

19998598 is a deficient number, since it is larger than the sum of its proper divisors (9999302).

19998598 is an equidigital number, since it uses as much as digits as its factorization.

19998598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999301.

The product of its digits is 2099520, while the sum is 58.

The square root of 19998598 is about 4471.9792038872. The cubic root of 19998598 is about 271.4354188221.

The spelling of 19998598 in words is "nineteen million, nine hundred ninety-eight thousand, five hundred ninety-eight".