394345279 has 2 divisors, whose sum is σ = 394345280. Its totient is φ = 394345278.

The previous prime is 394345241. The next prime is 394345307. The reversal of 394345279 is 972543493.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394345279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394325279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197172639 + 197172640.

It is an arithmetic number, because the mean of its divisors is an integer number (197172640).

Almost surely, 2^394345279 is an apocalyptic number.

394345279 is a deficient number, since it is larger than the sum of its proper divisors (1).

394345279 is an equidigital number, since it uses as much as digits as its factorization.

394345279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 46.

The square root of 394345279 is about 19858.1287889871. The cubic root of 394345279 is about 733.3177805012.

The spelling of 394345279 in words is "three hundred ninety-four million, three hundred forty-five thousand, two hundred seventy-nine".