19898697 has 16 divisors (see below), whose sum is σ = 32654720. Its totient is φ = 10495872.

The previous prime is 19898693. The next prime is 19898701. The reversal of 19898697 is 79689891.

It is an interprime number because it is at equal distance from previous prime (19898693) and next prime (19898701).

It is not a de Polignac number, because 19898697 - 2² = 19898693 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19898693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36172 + ... + 36717.

It is an arithmetic number, because the mean of its divisors is an integer number (2040920).

Almost surely, 2^19898697 is an apocalyptic number.

It is an amenable number.

19898697 is a deficient number, since it is larger than the sum of its proper divisors (12756023).

19898697 is a wasteful number, since it uses less digits than its factorization.

19898697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72912.

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

The square root of 19898697 is about 4460.7955568486. The cubic root of 19898697 is about 270.9826879461.

The spelling of 19898697 in words is "nineteen million, eight hundred ninety-eight thousand, six hundred ninety-seven".