19998798 has 8 divisors (see below), whose sum is σ = 39997608. Its totient is φ = 6666264.

The previous prime is 19998779. The next prime is 19998809. The reversal of 19998798 is 89789991.

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

19998798 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666561 + ... + 1666572.

It is an arithmetic number, because the mean of its divisors is an integer number (4999701).

Almost surely, 2^19998798 is an apocalyptic number.

19998798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19998798 is a wasteful number, since it uses less digits than its factorization.

19998798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333138.

The product of its digits is 2939328, while the sum is 60.

The square root of 19998798 is about 4472.0015652949. The cubic root of 19998798 is about 271.4363236673.

The spelling of 19998798 in words is "nineteen million, nine hundred ninety-eight thousand, seven hundred ninety-eight".