195979 has 4 divisors (see below), whose sum is σ = 223984. Its totient is φ = 167976.

The previous prime is 195977. The next prime is 195991. The reversal of 195979 is 979591.

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

It is a cyclic number.

It is not a de Polignac number, because 195979 - 2¹ = 195977 is a prime.

It is a Duffinian number.

195979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (195971) 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, 13992 + ... + 14005.

It is an arithmetic number, because the mean of its divisors is an integer number (55996).

2¹⁹⁵⁹⁷⁹ is an apocalyptic number.

195979 is a deficient number, since it is larger than the sum of its proper divisors (28005).

195979 is an equidigital number, since it uses as much as digits as its factorization.

195979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28004.

The product of its digits is 25515, while the sum is 40.

The square root of 195979 is about 442.6951547058. The cubic root of 195979 is about 58.0857826952.

The spelling of 195979 in words is "one hundred ninety-five thousand, nine hundred seventy-nine".