394404193 has 2 divisors, whose sum is σ = 394404194. Its totient is φ = 394404192.

The previous prime is 394404187. The next prime is 394404259. The reversal of 394404193 is 391404493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244390689 + 150013504 = 15633^2 + 12248^2 .

It is an emirp because it is prime and its reverse (391404493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394404193 - 2¹³ = 394396001 is a prime.

It is not a weakly prime, because it can be changed into another prime (394408193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197202096 + 197202097.

It is an arithmetic number, because the mean of its divisors is an integer number (197202097).

Almost surely, 2^394404193 is an apocalyptic number.

It is an amenable number.

394404193 is a deficient number, since it is larger than the sum of its proper divisors (1).

394404193 is an equidigital number, since it uses as much as digits as its factorization.

394404193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 394404193 is about 19859.6121059803. The cubic root of 394404193 is about 733.3542971739.

The spelling of 394404193 in words is "three hundred ninety-four million, four hundred four thousand, one hundred ninety-three".