195940439 has 2 divisors, whose sum is σ = 195940440. Its totient is φ = 195940438.

The previous prime is 195940411. The next prime is 195940441. The reversal of 195940439 is 934049591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195940439 - 2⁸ = 195940183 is a prime.

Together with 195940441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195940439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195940489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97970219 + 97970220.

It is an arithmetic number, because the mean of its divisors is an integer number (97970220).

Almost surely, 2^195940439 is an apocalyptic number.

195940439 is a deficient number, since it is larger than the sum of its proper divisors (1).

195940439 is an equidigital number, since it uses as much as digits as its factorization.

195940439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 195940439 is about 13997.8726598008. The cubic root of 195940439 is about 580.8197277546.

The spelling of 195940439 in words is "one hundred ninety-five million, nine hundred forty thousand, four hundred thirty-nine".