394149647 has 2 divisors, whose sum is σ = 394149648. Its totient is φ = 394149646.

The previous prime is 394149629. The next prime is 394149667. The reversal of 394149647 is 746941493.

It is a weak prime.

It is an emirp because it is prime and its reverse (746941493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394149647 - 2⁸ = 394149391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394149667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197074823 + 197074824.

It is an arithmetic number, because the mean of its divisors is an integer number (197074824).

Almost surely, 2^394149647 is an apocalyptic number.

394149647 is a deficient number, since it is larger than the sum of its proper divisors (1).

394149647 is an equidigital number, since it uses as much as digits as its factorization.

394149647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 394149647 is about 19853.2024368866. The cubic root of 394149647 is about 733.1964957951.

The spelling of 394149647 in words is "three hundred ninety-four million, one hundred forty-nine thousand, six hundred forty-seven".