394404347 has 2 divisors, whose sum is σ = 394404348. Its totient is φ = 394404346.

The previous prime is 394404319. The next prime is 394404359. The reversal of 394404347 is 743404493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394404347 - 2¹⁴ = 394387963 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394404347.

It is not a weakly prime, because it can be changed into another prime (394404547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197202173 + 197202174.

It is an arithmetic number, because the mean of its divisors is an integer number (197202174).

Almost surely, 2^394404347 is an apocalyptic number.

394404347 is a deficient number, since it is larger than the sum of its proper divisors (1).

394404347 is an equidigital number, since it uses as much as digits as its factorization.

394404347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 394404347 is about 19859.6159831956. The cubic root of 394404347 is about 733.3543926230.

The spelling of 394404347 in words is "three hundred ninety-four million, four hundred four thousand, three hundred forty-seven".