7973221 has 12 divisors (see below), whose sum is σ = 8664768. Its totient is φ = 7332032.

The previous prime is 7973219. The next prime is 7973227. The reversal of 7973221 is 1223797.

It is not a de Polignac number, because 7973221 - 2¹ = 7973219 is a prime.

It is a super-2 number, since 2×7973221² = 127144506229682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7973227) 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 11 ways as a sum of consecutive naturals, for example, 13290 + ... + 13876.

It is an arithmetic number, because the mean of its divisors is an integer number (722064).

Almost surely, 2^7973221 is an apocalyptic number.

It is an amenable number.

7973221 is a deficient number, since it is larger than the sum of its proper divisors (691547).

7973221 is a wasteful number, since it uses less digits than its factorization.

7973221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668 (or 651 counting only the distinct ones).

The product of its digits is 5292, while the sum is 31.

The square root of 7973221 is about 2823.6892534413. The cubic root of 7973221 is about 199.7765922044.

The spelling of 7973221 in words is "seven million, nine hundred seventy-three thousand, two hundred twenty-one".