195859 has 4 divisors (see below), whose sum is σ = 198616. Its totient is φ = 193104.

The previous prime is 195817. The next prime is 195863. The reversal of 195859 is 958591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958591 = 101 ⋅9491.

It is a cyclic number.

It is not a de Polignac number, because 195859 - 2⁷ = 195731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1269 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (49654).

2¹⁹⁵⁸⁵⁹ is an apocalyptic number.

195859 is a deficient number, since it is larger than the sum of its proper divisors (2757).

195859 is an equidigital number, since it uses as much as digits as its factorization.

195859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756.

The product of its digits is 16200, while the sum is 37.

The square root of 195859 is about 442.5596005060. The cubic root of 195859 is about 58.0739247630.

The spelling of 195859 in words is "one hundred ninety-five thousand, eight hundred fifty-nine".