394372217 has 2 divisors, whose sum is σ = 394372218. Its totient is φ = 394372216.

The previous prime is 394372201. The next prime is 394372241. The reversal of 394372217 is 712273493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304293136 + 90079081 = 17444^2 + 9491^2 .

It is a cyclic number.

It is not a de Polignac number, because 394372217 - 2⁴ = 394372201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394372717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197186108 + 197186109.

It is an arithmetic number, because the mean of its divisors is an integer number (197186109).

Almost surely, 2^394372217 is an apocalyptic number.

It is an amenable number.

394372217 is a deficient number, since it is larger than the sum of its proper divisors (1).

394372217 is an equidigital number, since it uses as much as digits as its factorization.

394372217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 394372217 is about 19858.8070386919. The cubic root of 394372217 is about 733.3344779367.

The spelling of 394372217 in words is "three hundred ninety-four million, three hundred seventy-two thousand, two hundred seventeen".