7980321 has 4 divisors (see below), whose sum is σ = 10640432. Its totient is φ = 5320212.

The previous prime is 7980319. The next prime is 7980331. The reversal of 7980321 is 1230897.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1230897 = 3 ⋅410299.

It is not a de Polignac number, because 7980321 - 2¹ = 7980319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7980311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1330051 + ... + 1330056.

It is an arithmetic number, because the mean of its divisors is an integer number (2660108).

Almost surely, 2^7980321 is an apocalyptic number.

It is an amenable number.

7980321 is a deficient number, since it is larger than the sum of its proper divisors (2660111).

7980321 is a wasteful number, since it uses less digits than its factorization.

7980321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660110.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 7980321 is about 2824.9461941779. The cubic root of 7980321 is about 199.8358736829.

The spelling of 7980321 in words is "seven million, nine hundred eighty thousand, three hundred twenty-one".