199997698 has 8 divisors (see below), whose sum is σ = 301021308. Its totient is φ = 99657264.

The previous prime is 199997689. The next prime is 199997723. The reversal of 199997698 is 896799991.

It can be written as a sum of positive squares in 2 ways, for example, as 174160809 + 25836889 = 13197^2 + 5083^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170061 + ... + 171232.

Almost surely, 2^199997698 is an apocalyptic number.

199997698 is a deficient number, since it is larger than the sum of its proper divisors (101023610).

199997698 is a wasteful number, since it uses less digits than its factorization.

199997698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341588.

The product of its digits is 19840464, while the sum is 67.

The square root of 199997698 is about 14142.0542355062. The cubic root of 199997698 is about 584.8013039377.

The spelling of 199997698 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred ninety-eight".