394404319 has 2 divisors, whose sum is σ = 394404320. Its totient is φ = 394404318.

The previous prime is 394404313. The next prime is 394404347. The reversal of 394404319 is 913404493.

It is a weak prime.

It is an emirp because it is prime and its reverse (913404493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394404319 - 2⁵ = 394404287 is a prime.

It is a super-2 number, since 2×394404319² = 311109533691707522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394404313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197202159 + 197202160.

It is an arithmetic number, because the mean of its divisors is an integer number (197202160).

Almost surely, 2^394404319 is an apocalyptic number.

394404319 is a deficient number, since it is larger than the sum of its proper divisors (1).

394404319 is an equidigital number, since it uses as much as digits as its factorization.

394404319 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 394404319 is about 19859.6152782475. The cubic root of 394404319 is about 733.3543752686.

The spelling of 394404319 in words is "three hundred ninety-four million, four hundred four thousand, three hundred nineteen".