395665243 has 2 divisors, whose sum is σ = 395665244. Its totient is φ = 395665242.

The previous prime is 395665229. The next prime is 395665261. The reversal of 395665243 is 342566593.

It is a weak prime.

It is an emirp because it is prime and its reverse (342566593) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-395665243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 395665243.

It is not a weakly prime, because it can be changed into another prime (395665213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197832621 + 197832622.

It is an arithmetic number, because the mean of its divisors is an integer number (197832622).

Almost surely, 2^395665243 is an apocalyptic number.

395665243 is a deficient number, since it is larger than the sum of its proper divisors (1).

395665243 is an equidigital number, since it uses as much as digits as its factorization.

395665243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 43.

The square root of 395665243 is about 19891.3358777132. The cubic root of 395665243 is about 734.1350635095.

The spelling of 395665243 in words is "three hundred ninety-five million, six hundred sixty-five thousand, two hundred forty-three".