195879 has 4 divisors (see below), whose sum is σ = 261176. Its totient is φ = 130584.

The previous prime is 195869. The next prime is 195883. The reversal of 195879 is 978591.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 195879 - 2⁴ = 195863 is a prime.

It is a D-number.

It is a Duffinian number.

195879 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 195879.

It is not an unprimeable number, because it can be changed into a prime (195809) 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, 32644 + ... + 32649.

It is an arithmetic number, because the mean of its divisors is an integer number (65294).

2¹⁹⁵⁸⁷⁹ is an apocalyptic number.

195879 is a deficient number, since it is larger than the sum of its proper divisors (65297).

195879 is an equidigital number, since it uses as much as digits as its factorization.

195879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65296.

The product of its digits is 22680, while the sum is 39.

The square root of 195879 is about 442.5821957558. The cubic root of 195879 is about 58.0759014213.

It can be divided in two parts, 195 and 879, that multiplied together give a triangular number (171405 = T₅₈₅).

The spelling of 195879 in words is "one hundred ninety-five thousand, eight hundred seventy-nine".