8404321 has 4 divisors (see below), whose sum is σ = 8410644. Its totient is φ = 8398000.

The previous prime is 8404313. The next prime is 8404337. The reversal of 8404321 is 1234048.

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 3651921 + 4752400 = 1911^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 8404321 - 2³ = 8404313 is a prime.

It is a super-2 number, since 2×8404321² = 141265222942082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8404292 and 8404301.

It is not an unprimeable number, because it can be changed into a prime (8404301) 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, 310 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (2102661).

Almost surely, 2^8404321 is an apocalyptic number.

It is an amenable number.

8404321 is a deficient number, since it is larger than the sum of its proper divisors (6323).

8404321 is a wasteful number, since it uses less digits than its factorization.

8404321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 8404321 is about 2899.0206967181. The cubic root of 8404321 is about 203.3141213297.

Adding to 8404321 its reverse (1234048), we get a palindrome (9638369).

The spelling of 8404321 in words is "eight million, four hundred four thousand, three hundred twenty-one".