199959597 has 20 divisors (see below), whose sum is σ = 299963840. Its totient is φ = 133293276.

The previous prime is 199959587. The next prime is 199959623. The reversal of 199959597 is 795959991.

It is not a de Polignac number, because 199959597 - 2⁷ = 199959469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199959577) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14604 + ... + 24762.

It is an arithmetic number, because the mean of its divisors is an integer number (14998192).

Almost surely, 2^199959597 is an apocalyptic number.

It is an amenable number.

199959597 is a deficient number, since it is larger than the sum of its proper divisors (100004243).

199959597 is an frugal number, since it uses more digits than its factorization.

199959597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186 (or 10162 counting only the distinct ones).

The product of its digits is 10333575, while the sum is 63.

The square root of 199959597 is about 14140.7070898170. The cubic root of 199959597 is about 584.7641652943.

It can be divided in two parts, 19995 and 9597, that added together give a palindrome (29592).

The spelling of 199959597 in words is "one hundred ninety-nine million, nine hundred fifty-nine thousand, five hundred ninety-seven".