393968618 has 8 divisors (see below), whose sum is σ = 594254880. Its totient is φ = 195883660.

The previous prime is 393968611. The next prime is 393968621. The reversal of 393968618 is 816869393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×393968618² = 310422543937659848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 393968618.

It is not an unprimeable number, because it can be changed into a prime (393968611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549878 + ... + 550593.

It is an arithmetic number, because the mean of its divisors is an integer number (74281860).

Almost surely, 2^393968618 is an apocalyptic number.

393968618 is a deficient number, since it is larger than the sum of its proper divisors (200286262).

393968618 is a wasteful number, since it uses less digits than its factorization.

393968618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100652.

The product of its digits is 1679616, while the sum is 53.

The square root of 393968618 is about 19848.6427243779. The cubic root of 393968618 is about 733.0842286607.

The spelling of 393968618 in words is "three hundred ninety-three million, nine hundred sixty-eight thousand, six hundred eighteen".