195439 has 4 divisors (see below), whose sum is σ = 198424. Its totient is φ = 192456.

The previous prime is 195427. The next prime is 195443. The reversal of 195439 is 934591.

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 195439 - 2⁵ = 195407 is a prime.

It is a Duffinian number.

195439 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 195439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195469) 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, 1392 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (49606).

2¹⁹⁵⁴³⁹ is an apocalyptic number.

195439 is a deficient number, since it is larger than the sum of its proper divisors (2985).

195439 is an equidigital number, since it uses as much as digits as its factorization.

195439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984.

The product of its digits is 4860, while the sum is 31.

The square root of 195439 is about 442.0848334879. The cubic root of 195439 is about 58.0323838179.

The spelling of 195439 in words is "one hundred ninety-five thousand, four hundred thirty-nine".