395921 has 2 divisors, whose sum is σ = 395922. Its totient is φ = 395920.

The previous prime is 395909. The next prime is 395953. The reversal of 395921 is 129593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215296 + 180625 = 464^2 + 425^2 .

It is an emirp because it is prime and its reverse (129593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 395921 - 2¹⁰ = 394897 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 395921.

It is not a weakly prime, because it can be changed into another prime (395971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197960 + 197961.

It is an arithmetic number, because the mean of its divisors is an integer number (197961).

2³⁹⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

395921 is a deficient number, since it is larger than the sum of its proper divisors (1).

395921 is an equidigital number, since it uses as much as digits as its factorization.

395921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 395921 is about 629.2225361508. Note that the first 3 decimals coincide. The cubic root of 395921 is about 73.4293210448.

It can be divided in two parts, 39592 and 1, that added together give a palindrome (39593).

The spelling of 395921 in words is "three hundred ninety-five thousand, nine hundred twenty-one".