199969 has 16 divisors (see below), whose sum is σ = 259200. Its totient is φ = 152880.

The previous prime is 199967. The next prime is 199999. The reversal of 199969 is 969991.

It is not a de Polignac number, because 199969 - 2¹ = 199967 is a prime.

It is a super-2 number, since 2×199969² = 79975201922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3747 + ... + 3799.

It is an arithmetic number, because the mean of its divisors is an integer number (16200).

2¹⁹⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

199969 is a deficient number, since it is larger than the sum of its proper divisors (59231).

199969 is an equidigital number, since it uses as much as digits as its factorization.

199969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 71 counting only the distinct ones).

The product of its digits is 39366, while the sum is 43.

The square root of 199969 is about 447.1789351032. The cubic root of 199969 is about 58.4773331231.

The spelling of 199969 in words is "one hundred ninety-nine thousand, nine hundred sixty-nine".