19840198 has 24 divisors (see below), whose sum is σ = 34773192. Its totient is φ = 8465184.

The previous prime is 19840153. The next prime is 19840211. The reversal of 19840198 is 89104891.

It is a self number, because there is not a number n which added to its sum of digits gives 19840198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43186 + ... + 43642.

It is an arithmetic number, because the mean of its divisors is an integer number (1448883).

Almost surely, 2^19840198 is an apocalyptic number.

19840198 is a deficient number, since it is larger than the sum of its proper divisors (14932994).

19840198 is a wasteful number, since it uses less digits than its factorization.

19840198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 19840198 is about 4454.2337163647. The cubic root of 19840198 is about 270.7168786486.

The spelling of 19840198 in words is "nineteen million, eight hundred forty thousand, one hundred ninety-eight".