19998498 has 16 divisors (see below), whose sum is σ = 43073856. Its totient is φ = 6153360.

The previous prime is 19998497. The next prime is 19998521. The reversal of 19998498 is 89489991.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19998491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128118 + ... + 128273.

It is an arithmetic number, because the mean of its divisors is an integer number (2692116).

Almost surely, 2^19998498 is an apocalyptic number.

19998498 is an abundant number, since it is smaller than the sum of its proper divisors (23075358).

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

19998498 is a wasteful number, since it uses less digits than its factorization.

19998498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256409.

The product of its digits is 1679616, while the sum is 57.

The square root of 19998498 is about 4471.9680231415. The cubic root of 19998498 is about 271.4349663973.

The spelling of 19998498 in words is "nineteen million, nine hundred ninety-eight thousand, four hundred ninety-eight".