393748221 has 12 divisors (see below), whose sum is σ = 529906272. Its totient is φ = 260067024.

The previous prime is 393748217. The next prime is 393748259. The reversal of 393748221 is 122847393.

It is not a de Polignac number, because 393748221 - 2² = 393748217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 393748221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393748261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30120 + ... + 41166.

It is an arithmetic number, because the mean of its divisors is an integer number (44158856).

Almost surely, 2^393748221 is an apocalyptic number.

It is an amenable number.

393748221 is a deficient number, since it is larger than the sum of its proper divisors (136158051).

393748221 is a wasteful number, since it uses less digits than its factorization.

393748221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11268 (or 11159 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 393748221 is about 19843.0900063473. The cubic root of 393748221 is about 732.9475005936.

The spelling of 393748221 in words is "three hundred ninety-three million, seven hundred forty-eight thousand, two hundred twenty-one".