199913 has 4 divisors (see below), whose sum is σ = 228480. Its totient is φ = 171348.

The previous prime is 199909. The next prime is 199921. The reversal of 199913 is 319991.

199913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199913 - 2² = 199909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199913.

It is not an unprimeable number, because it can be changed into a prime (199933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14273 + ... + 14286.

It is an arithmetic number, because the mean of its divisors is an integer number (57120).

2¹⁹⁹⁹¹³ is an apocalyptic number.

It is an amenable number.

199913 is a deficient number, since it is larger than the sum of its proper divisors (28567).

199913 is an equidigital number, since it uses as much as digits as its factorization.

199913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28566.

The product of its digits is 2187, while the sum is 32.

The square root of 199913 is about 447.1163159626. The cubic root of 199913 is about 58.4718738830.

The spelling of 199913 in words is "one hundred ninety-nine thousand, nine hundred thirteen".