7937221 has 4 divisors (see below), whose sum is σ = 7957612. Its totient is φ = 7916832.

The previous prime is 7937201. The next prime is 7937243. The reversal of 7937221 is 1227397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1227397 = 107 ⋅11471.

It can be written as a sum of positive squares in 2 ways, for example, as 5013121 + 2924100 = 2239^2 + 1710^2 .

It is a cyclic number.

It is not a de Polignac number, because 7937221 - 2¹⁵ = 7904453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7937201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9600 + ... + 10393.

It is an arithmetic number, because the mean of its divisors is an integer number (1989403).

Almost surely, 2^7937221 is an apocalyptic number.

It is an amenable number.

7937221 is a deficient number, since it is larger than the sum of its proper divisors (20391).

7937221 is a wasteful number, since it uses less digits than its factorization.

7937221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20390.

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

The square root of 7937221 is about 2817.3074024678. The cubic root of 7937221 is about 199.4754671960.

The spelling of 7937221 in words is "seven million, nine hundred thirty-seven thousand, two hundred twenty-one".