393646864 has 40 divisors (see below), whose sum is σ = 864597440. Its totient is φ = 172119168.

The previous prime is 393646861. The next prime is 393646867. The reversal of 393646864 is 468646393.

It is an interprime number because it is at equal distance from previous prime (393646861) and next prime (393646867).

It is not an unprimeable number, because it can be changed into a prime (393646861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45852 + ... + 53755.

It is an arithmetic number, because the mean of its divisors is an integer number (21614936).

Almost surely, 2^393646864 is an apocalyptic number.

It is an amenable number.

393646864 is an abundant number, since it is smaller than the sum of its proper divisors (470950576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393646864 is a wasteful number, since it uses less digits than its factorization.

393646864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99647 (or 99641 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 49.

The square root of 393646864 is about 19840.5358798597. The cubic root of 393646864 is about 732.8846044490.

The spelling of 393646864 in words is "three hundred ninety-three million, six hundred forty-six thousand, eight hundred sixty-four".