195999 has 8 divisors (see below), whose sum is σ = 264960. Its totient is φ = 128856.

The previous prime is 195997. The next prime is 196003. The reversal of 195999 is 999591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 195999 - 2¹ = 195997 is a prime.

195999 is a modest number, since divided by 999 gives 195 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 195999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177 + ... + 650.

It is an arithmetic number, because the mean of its divisors is an integer number (33120).

2¹⁹⁵⁹⁹⁹ is an apocalyptic number.

195999 is the 237-th nonagonal number.

195999 is a deficient number, since it is larger than the sum of its proper divisors (68961).

195999 is an equidigital number, since it uses as much as digits as its factorization.

195999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909.

The product of its digits is 32805, while the sum is 42.

The square root of 195999 is about 442.7177430373. The cubic root of 195999 is about 58.0877585466.

The spelling of 195999 in words is "one hundred ninety-five thousand, nine hundred ninety-nine".