19897098 has 32 divisors (see below), whose sum is σ = 43411200. Its totient is φ = 6042816.

The previous prime is 19897079. The next prime is 19897109. The reversal of 19897098 is 89079891.

It is a self number, because there is not a number n which added to its sum of digits gives 19897098.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4548 + ... + 7776.

It is an arithmetic number, because the mean of its divisors is an integer number (1356600).

Almost surely, 2^19897098 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19897098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21705600).

19897098 is an abundant number, since it is smaller than the sum of its proper divisors (23514102).

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

19897098 is a wasteful number, since it uses less digits than its factorization.

19897098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 19897098 is about 4460.6163251282. The cubic root of 19897098 is about 270.9754292979.

The spelling of 19897098 in words is "nineteen million, eight hundred ninety-seven thousand, ninety-eight".