394705169 has 2 divisors, whose sum is σ = 394705170. Its totient is φ = 394705168.

The previous prime is 394705163. The next prime is 394705187. The reversal of 394705169 is 961507493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389470225 + 5234944 = 19735^2 + 2288^2 .

It is a cyclic number.

It is not a de Polignac number, because 394705169 - 2²⁸ = 126269713 is a prime.

It is a super-2 number, since 2×394705169² = 311584340870637122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394705163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197352584 + 197352585.

It is an arithmetic number, because the mean of its divisors is an integer number (197352585).

Almost surely, 2^394705169 is an apocalyptic number.

It is an amenable number.

394705169 is a deficient number, since it is larger than the sum of its proper divisors (1).

394705169 is an equidigital number, since it uses as much as digits as its factorization.

394705169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 394705169 is about 19867.1882509831. The cubic root of 394705169 is about 733.5407944485.

The spelling of 394705169 in words is "three hundred ninety-four million, seven hundred five thousand, one hundred sixty-nine".