7986321 has 24 divisors (see below), whose sum is σ = 13316160. Its totient is φ = 4517856.

The previous prime is 7986317. The next prime is 7986331. The reversal of 7986321 is 1236897.

It is not a de Polignac number, because 7986321 - 2² = 7986317 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7986331) 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 23 ways as a sum of consecutive naturals, for example, 6286 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (554840).

Almost surely, 2^7986321 is an apocalyptic number.

It is an amenable number.

7986321 is a deficient number, since it is larger than the sum of its proper divisors (5329839).

7986321 is a wasteful number, since it uses less digits than its factorization.

7986321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285 (or 1282 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 7986321 is about 2826.0079617722. The cubic root of 7986321 is about 199.8859433010.

The spelling of 7986321 in words is "seven million, nine hundred eighty-six thousand, three hundred twenty-one".