394339643 has 2 divisors, whose sum is σ = 394339644. Its totient is φ = 394339642.

The previous prime is 394339579. The next prime is 394339697. The reversal of 394339643 is 346933493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394339643 - 2⁶ = 394339579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394339594 and 394339603.

It is not a weakly prime, because it can be changed into another prime (390339643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197169821 + 197169822.

It is an arithmetic number, because the mean of its divisors is an integer number (197169822).

Almost surely, 2^394339643 is an apocalyptic number.

394339643 is a deficient number, since it is larger than the sum of its proper divisors (1).

394339643 is an equidigital number, since it uses as much as digits as its factorization.

394339643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 44.

The square root of 394339643 is about 19857.9868818569. The cubic root of 394339643 is about 733.3142869479.

The spelling of 394339643 in words is "three hundred ninety-four million, three hundred thirty-nine thousand, six hundred forty-three".