195409 has 4 divisors (see below), whose sum is σ = 196416. Its totient is φ = 194404.

The previous prime is 195407. The next prime is 195413. The reversal of 195409 is 904591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 195409 - 2¹ = 195407 is a prime.

It is a Duffinian number.

195409 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195401) 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, 109 + ... + 634.

It is an arithmetic number, because the mean of its divisors is an integer number (49104).

2¹⁹⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

195409 is a deficient number, since it is larger than the sum of its proper divisors (1007).

195409 is an equidigital number, since it uses as much as digits as its factorization.

195409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 195409 is about 442.0509020464. The cubic root of 195409 is about 58.0294143311.

The spelling of 195409 in words is "one hundred ninety-five thousand, four hundred nine".