195803939 has 2 divisors, whose sum is σ = 195803940. Its totient is φ = 195803938.

The previous prime is 195803921. The next prime is 195804001. The reversal of 195803939 is 939308591.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195803939 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 195803893 and 195803902.

It is not a weakly prime, because it can be changed into another prime (195808939) 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 as a sum of consecutive naturals, namely, 97901969 + 97901970.

It is an arithmetic number, because the mean of its divisors is an integer number (97901970).

Almost surely, 2^195803939 is an apocalyptic number.

195803939 is a deficient number, since it is larger than the sum of its proper divisors (1).

195803939 is an equidigital number, since it uses as much as digits as its factorization.

195803939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 195803939 is about 13992.9960694628. The cubic root of 195803939 is about 580.6848222859.

The spelling of 195803939 in words is "one hundred ninety-five million, eight hundred three thousand, nine hundred thirty-nine".