19897698 has 8 divisors (see below), whose sum is σ = 39795408. Its totient is φ = 6632564.

The previous prime is 19897663. The next prime is 19897699. The reversal of 19897698 is 89679891.

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

19897698 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (19897699) 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, 1658136 + ... + 1658147.

It is an arithmetic number, because the mean of its divisors is an integer number (4974426).

Almost surely, 2^19897698 is an apocalyptic number.

19897698 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.

19897698 is a wasteful number, since it uses less digits than its factorization.

19897698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316288.

The product of its digits is 1959552, while the sum is 57.

The square root of 19897698 is about 4460.6835799012. The cubic root of 19897698 is about 270.9781530388.

The spelling of 19897698 in words is "nineteen million, eight hundred ninety-seven thousand, six hundred ninety-eight".