395640317 has 2 divisors, whose sum is σ = 395640318. Its totient is φ = 395640316.

The previous prime is 395640307. The next prime is 395640341. The reversal of 395640317 is 713046593.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217444516 + 178195801 = 14746^2 + 13349^2 .

It is a cyclic number.

It is not a de Polignac number, because 395640317 - 2⁸ = 395640061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395640307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197820158 + 197820159.

It is an arithmetic number, because the mean of its divisors is an integer number (197820159).

Almost surely, 2^395640317 is an apocalyptic number.

It is an amenable number.

395640317 is a deficient number, since it is larger than the sum of its proper divisors (1).

395640317 is an equidigital number, since it uses as much as digits as its factorization.

395640317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 395640317 is about 19890.7093136469. The cubic root of 395640317 is about 734.1196469124.

The spelling of 395640317 in words is "three hundred ninety-five million, six hundred forty thousand, three hundred seventeen".