395970217 has 2 divisors, whose sum is σ = 395970218. Its totient is φ = 395970216.

The previous prime is 395970149. The next prime is 395970227. The reversal of 395970217 is 712079593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395970201 + 16 = 19899^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-395970217 is a prime.

It is not a weakly prime, because it can be changed into another prime (395970227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197985108 + 197985109.

It is an arithmetic number, because the mean of its divisors is an integer number (197985109).

Almost surely, 2^395970217 is an apocalyptic number.

It is an amenable number.

395970217 is a deficient number, since it is larger than the sum of its proper divisors (1).

395970217 is an equidigital number, since it uses as much as digits as its factorization.

395970217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 395970217 is about 19899.0004020302. Note that the first 3 decimals coincide. The cubic root of 395970217 is about 734.3236358872.

The spelling of 395970217 in words is "three hundred ninety-five million, nine hundred seventy thousand, two hundred seventeen".