7997321 has 4 divisors (see below), whose sum is σ = 8116752. Its totient is φ = 7877892.

The previous prime is 7997303. The next prime is 7997323. The reversal of 7997321 is 1237997.

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: 1237997 = 59 ⋅20983.

It is a cyclic number.

It is not a de Polignac number, because 7997321 - 2⁶ = 7997257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7997323) 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, 59615 + ... + 59748.

It is an arithmetic number, because the mean of its divisors is an integer number (2029188).

Almost surely, 2^7997321 is an apocalyptic number.

It is an amenable number.

7997321 is a deficient number, since it is larger than the sum of its proper divisors (119431).

7997321 is a wasteful number, since it uses less digits than its factorization.

7997321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119430.

The product of its digits is 23814, while the sum is 38.

The square root of 7997321 is about 2827.9535003249. The cubic root of 7997321 is about 199.9776725075.

The spelling of 7997321 in words is "seven million, nine hundred ninety-seven thousand, three hundred twenty-one".