19788198 has 8 divisors (see below), whose sum is σ = 39576408. Its totient is φ = 6596064.

The previous prime is 19788193. The next prime is 19788227. The reversal of 19788198 is 89188791.

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

19788198 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 19788198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19788193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649011 + ... + 1649022.

It is an arithmetic number, because the mean of its divisors is an integer number (4947051).

Almost surely, 2^19788198 is an apocalyptic number.

19788198 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.

19788198 is a wasteful number, since it uses less digits than its factorization.

19788198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298038.

The product of its digits is 290304, while the sum is 51.

The square root of 19788198 is about 4448.3927434524. The cubic root of 19788198 is about 270.4801606782.

The spelling of 19788198 in words is "nineteen million, seven hundred eighty-eight thousand, one hundred ninety-eight".