393494636 has 24 divisors (see below), whose sum is σ = 727189680. Its totient is φ = 185792832.

The previous prime is 393494587. The next prime is 393494639. The reversal of 393494636 is 636494393.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (393494639) 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 7 ways as a sum of consecutive naturals, for example, 15926 + ... + 32258.

It is an arithmetic number, because the mean of its divisors is an integer number (30299570).

Almost surely, 2^393494636 is an apocalyptic number.

It is an amenable number.

393494636 is a deficient number, since it is larger than the sum of its proper divisors (333695044).

393494636 is a wasteful number, since it uses less digits than its factorization.

393494636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16673 (or 16671 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 47.

The square root of 393494636 is about 19836.6992213927. The cubic root of 393494636 is about 732.7901204905.

The spelling of 393494636 in words is "three hundred ninety-three million, four hundred ninety-four thousand, six hundred thirty-six".