394662217 has 2 divisors, whose sum is σ = 394662218. Its totient is φ = 394662216.

The previous prime is 394662197. The next prime is 394662241. The reversal of 394662217 is 712266493.

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., 325838601 + 68823616 = 18051^2 + 8296^2 .

It is a cyclic number.

It is not a de Polignac number, because 394662217 - 2¹¹ = 394660169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394662217.

It is not a weakly prime, because it can be changed into another prime (394662277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197331108 + 197331109.

It is an arithmetic number, because the mean of its divisors is an integer number (197331109).

Almost surely, 2^394662217 is an apocalyptic number.

It is an amenable number.

394662217 is a deficient number, since it is larger than the sum of its proper divisors (1).

394662217 is an equidigital number, since it uses as much as digits as its factorization.

394662217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 394662217 is about 19866.1072432422. The cubic root of 394662217 is about 733.5141853998.

The spelling of 394662217 in words is "three hundred ninety-four million, six hundred sixty-two thousand, two hundred seventeen".