393318221 has 8 divisors (see below), whose sum is σ = 414535200. Its totient is φ = 372152880.

The previous prime is 393318187. The next prime is 393318223. The reversal of 393318221 is 122813393.

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

It is a cyclic number.

It is not a de Polignac number, because 393318221 - 2⁶ = 393318157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393318223) 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 7 ways as a sum of consecutive naturals, for example, 3266 + ... + 28236.

It is an arithmetic number, because the mean of its divisors is an integer number (51816900).

Almost surely, 2^393318221 is an apocalyptic number.

It is an amenable number.

393318221 is a deficient number, since it is larger than the sum of its proper divisors (21216979).

393318221 is a wasteful number, since it uses less digits than its factorization.

393318221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25819.

The product of its digits is 7776, while the sum is 32.

The square root of 393318221 is about 19832.2520405525. The cubic root of 393318221 is about 732.6805938020.

The spelling of 393318221 in words is "three hundred ninety-three million, three hundred eighteen thousand, two hundred twenty-one".