195208439 has 2 divisors, whose sum is σ = 195208440. Its totient is φ = 195208438.

The previous prime is 195208231. The next prime is 195208441. The reversal of 195208439 is 934802591.

It is a strong prime.

It is an emirp because it is prime and its reverse (934802591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195208439 - 2²⁰ = 194159863 is a prime.

Together with 195208441, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 195208396 and 195208405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195208469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97604219 + 97604220.

It is an arithmetic number, because the mean of its divisors is an integer number (97604220).

Almost surely, 2^195208439 is an apocalyptic number.

195208439 is a deficient number, since it is larger than the sum of its proper divisors (1).

195208439 is an equidigital number, since it uses as much as digits as its factorization.

195208439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 195208439 is about 13971.7013638282. The cubic root of 195208439 is about 580.0955441094.

The spelling of 195208439 in words is "one hundred ninety-five million, two hundred eight thousand, four hundred thirty-nine".