393221 has 4 divisors (see below), whose sum is σ = 394944. Its totient is φ = 391500.

The previous prime is 393209. The next prime is 393241. The reversal of 393221 is 122393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393221 - 2⁶ = 393157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 393193 and 393202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393241) 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, 455 + ... + 996.

It is an arithmetic number, because the mean of its divisors is an integer number (98736).

2³⁹³²²¹ is an apocalyptic number.

It is an amenable number.

393221 is a deficient number, since it is larger than the sum of its proper divisors (1723).

393221 is a wasteful number, since it uses less digits than its factorization.

393221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722.

The product of its digits is 324, while the sum is 20.

The square root of 393221 is about 627.0733609395. The cubic root of 393221 is about 73.2620220457.

The spelling of 393221 in words is "three hundred ninety-three thousand, two hundred twenty-one".