393906646 has 32 divisors (see below), whose sum is σ = 708526080. Its totient is φ = 160682400.

The previous prime is 393906607. The next prime is 393906649. The reversal of 393906646 is 646609393.

It is a junction number, because it is equal to n+sod(n) for n = 393906596 and 393906605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393906649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19035 + ... + 33913.

It is an arithmetic number, because the mean of its divisors is an integer number (22141440).

Almost surely, 2^393906646 is an apocalyptic number.

393906646 is a deficient number, since it is larger than the sum of its proper divisors (314619434).

393906646 is a wasteful number, since it uses less digits than its factorization.

393906646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14980.

The product of its (nonzero) digits is 629856, while the sum is 46.

The square root of 393906646 is about 19847.0815486812. The cubic root of 393906646 is about 733.0457881386.

The spelling of 393906646 in words is "three hundred ninety-three million, nine hundred six thousand, six hundred forty-six".