19897686 has 12 divisors (see below), whose sum is σ = 43111692. Its totient is φ = 6632556.

The previous prime is 19897663. The next prime is 19897699. The reversal of 19897686 is 68679891.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 552696 + ... + 552731.

It is an arithmetic number, because the mean of its divisors is an integer number (3592641).

Almost surely, 2^19897686 is an apocalyptic number.

19897686 is an abundant number, since it is smaller than the sum of its proper divisors (23214006).

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

19897686 is a wasteful number, since it uses less digits than its factorization.

19897686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105435 (or 1105432 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 19897686 is about 4460.6822348157. The cubic root of 19897686 is about 270.9780985645.

The spelling of 19897686 in words is "nineteen million, eight hundred ninety-seven thousand, six hundred eighty-six".