8390321 has 4 divisors (see below), whose sum is σ = 8398452. Its totient is φ = 8382192.

The previous prime is 8390311. The next prime is 8390323. The reversal of 8390321 is 1230938.

8390321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2436721 + 5953600 = 1561^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 8390321 - 2⁶ = 8390257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8390323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2246 + ... + 4671.

It is an arithmetic number, because the mean of its divisors is an integer number (2099613).

Almost surely, 2^8390321 is an apocalyptic number.

It is an amenable number.

8390321 is a deficient number, since it is larger than the sum of its proper divisors (8131).

8390321 is a wasteful number, since it uses less digits than its factorization.

8390321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 8390321 is about 2896.6050818156. The cubic root of 8390321 is about 203.2011643686.

The spelling of 8390321 in words is "eight million, three hundred ninety thousand, three hundred twenty-one".