7990321 has 4 divisors (see below), whose sum is σ = 7999552. Its totient is φ = 7981092.

The previous prime is 7990319. The next prime is 7990337. The reversal of 7990321 is 1230997.

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 7990321 - 2¹ = 7990319 is a prime.

It is a Duffinian number.

7990321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7994321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3165 + ... + 5098.

It is an arithmetic number, because the mean of its divisors is an integer number (1999888).

Almost surely, 2^7990321 is an apocalyptic number.

It is an amenable number.

7990321 is a deficient number, since it is larger than the sum of its proper divisors (9231).

7990321 is an equidigital number, since it uses as much as digits as its factorization.

7990321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9230.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 7990321 is about 2826.7155852685. The cubic root of 7990321 is about 199.9193091160.

The spelling of 7990321 in words is "seven million, nine hundred ninety thousand, three hundred twenty-one".