195904893 has 4 divisors (see below), whose sum is σ = 261206528. Its totient is φ = 130603260.

The previous prime is 195904879. The next prime is 195904897. The reversal of 195904893 is 398409591.

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 an emirpimes, since its reverse is a distinct semiprime: 398409591 = 3 ⋅132803197.

It is not a de Polignac number, because 195904893 - 2⁶ = 195904829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195904897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32650813 + ... + 32650818.

It is an arithmetic number, because the mean of its divisors is an integer number (65301632).

Almost surely, 2^195904893 is an apocalyptic number.

It is an amenable number.

195904893 is a deficient number, since it is larger than the sum of its proper divisors (65301635).

195904893 is an equidigital number, since it uses as much as digits as its factorization.

195904893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65301634.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 195904893 is about 13996.6029092777. The cubic root of 195904893 is about 580.7846030219.

The spelling of 195904893 in words is "one hundred ninety-five million, nine hundred four thousand, eight hundred ninety-three".