199997697 has 8 divisors (see below), whose sum is σ = 268261056. Its totient is φ = 132533072.

The previous prime is 199997689. The next prime is 199997723. The reversal of 199997697 is 796799991.

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

It is a cyclic number.

It is not a de Polignac number, because 199997697 - 2³ = 199997689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199997797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199098 + ... + 200099.

It is an arithmetic number, because the mean of its divisors is an integer number (33532632).

Almost surely, 2^199997697 is an apocalyptic number.

It is an amenable number.

199997697 is a deficient number, since it is larger than the sum of its proper divisors (68263359).

199997697 is a wasteful number, since it uses less digits than its factorization.

199997697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399367.

The product of its digits is 17360406, while the sum is 66.

The square root of 199997697 is about 14142.0542001507. The cubic root of 199997697 is about 584.8013029630.

The spelling of 199997697 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred ninety-seven".