394643493 has 12 divisors (see below), whose sum is σ = 570412128. Its totient is φ = 262924200.

The previous prime is 394643477. The next prime is 394643539. The reversal of 394643493 is 394346493.

It is not a de Polignac number, because 394643493 - 2⁴ = 394643477 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394643693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1168 + ... + 28118.

It is an arithmetic number, because the mean of its divisors is an integer number (47534344).

Almost surely, 2^394643493 is an apocalyptic number.

It is an amenable number.

394643493 is a deficient number, since it is larger than the sum of its proper divisors (175768635).

394643493 is a wasteful number, since it uses less digits than its factorization.

394643493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28584 (or 28581 counting only the distinct ones).

The product of its digits is 839808, while the sum is 45.

The square root of 394643493 is about 19865.6359827719. The cubic root of 394643493 is about 733.5025851535.

The spelling of 394643493 in words is "three hundred ninety-four million, six hundred forty-three thousand, four hundred ninety-three".