394478873 has 2 divisors, whose sum is σ = 394478874. Its totient is φ = 394478872.

The previous prime is 394478869. The next prime is 394478923. The reversal of 394478873 is 378874493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220581904 + 173896969 = 14852^2 + 13187^2 .

It is an emirp because it is prime and its reverse (378874493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394478873 - 2² = 394478869 is a prime.

It is a super-2 number, since 2×394478873² = 311227162486700258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (394418873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197239436 + 197239437.

It is an arithmetic number, because the mean of its divisors is an integer number (197239437).

Almost surely, 2^394478873 is an apocalyptic number.

It is an amenable number.

394478873 is a deficient number, since it is larger than the sum of its proper divisors (1).

394478873 is an equidigital number, since it uses as much as digits as its factorization.

394478873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 53.

The square root of 394478873 is about 19861.4922148362. The cubic root of 394478873 is about 733.4005808625.

The spelling of 394478873 in words is "three hundred ninety-four million, four hundred seventy-eight thousand, eight hundred seventy-three".