395207221 has 2 divisors, whose sum is σ = 395207222. Its totient is φ = 395207220.

The previous prime is 395207209. The next prime is 395207231. The reversal of 395207221 is 122702593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280931121 + 114276100 = 16761^2 + 10690^2 .

It is a cyclic number.

It is not a de Polignac number, because 395207221 - 2⁹ = 395206709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395207231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197603610 + 197603611.

It is an arithmetic number, because the mean of its divisors is an integer number (197603611).

Almost surely, 2^395207221 is an apocalyptic number.

It is an amenable number.

395207221 is a deficient number, since it is larger than the sum of its proper divisors (1).

395207221 is an equidigital number, since it uses as much as digits as its factorization.

395207221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 395207221 is about 19879.8194408299. The cubic root of 395207221 is about 733.8516759344.

The spelling of 395207221 in words is "three hundred ninety-five million, two hundred seven thousand, two hundred twenty-one".