199799 has 2 divisors, whose sum is σ = 199800. Its totient is φ = 199798.

The previous prime is 199783. The next prime is 199807. The reversal of 199799 is 997991.

It is a strong prime.

It is an emirp because it is prime and its reverse (997991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199799 - 2⁴ = 199783 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99899 + 99900.

It is an arithmetic number, because the mean of its divisors is an integer number (99900).

2¹⁹⁹⁷⁹⁹ is an apocalyptic number.

199799 is a deficient number, since it is larger than the sum of its proper divisors (1).

199799 is an equidigital number, since it uses as much as digits as its factorization.

199799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927, while the sum is 44.

The square root of 199799 is about 446.9888141777. The cubic root of 199799 is about 58.4607572788.

The spelling of 199799 in words is "one hundred ninety-nine thousand, seven hundred ninety-nine".