199797 has 16 divisors (see below), whose sum is σ = 295680. Its totient is φ = 119232.

The previous prime is 199783. The next prime is 199799. The reversal of 199797 is 797991.

199797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199797 - 2⁷ = 199669 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199799) 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, 1779 + ... + 1887.

It is an arithmetic number, because the mean of its divisors is an integer number (18480).

2¹⁹⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

199797 is a deficient number, since it is larger than the sum of its proper divisors (95883).

199797 is a wasteful number, since it uses less digits than its factorization.

199797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its digits is 35721, while the sum is 42.

The square root of 199797 is about 446.9865769797. The cubic root of 199797 is about 58.4605622129.

The spelling of 199797 in words is "one hundred ninety-nine thousand, seven hundred ninety-seven".