7908221 has 2 divisors, whose sum is σ = 7908222. Its totient is φ = 7908220.

The previous prime is 7908217. The next prime is 7908233. The reversal of 7908221 is 1228097.

It is a happy number.

7908221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4884100 + 3024121 = 2210^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 7908221 - 2² = 7908217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7908721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3954110 + 3954111.

It is an arithmetic number, because the mean of its divisors is an integer number (3954111).

Almost surely, 2^7908221 is an apocalyptic number.

It is an amenable number.

7908221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7908221 is an equidigital number, since it uses as much as digits as its factorization.

7908221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 7908221 is about 2812.1559345100. The cubic root of 7908221 is about 199.2322314286.

The spelling of 7908221 in words is "seven million, nine hundred eight thousand, two hundred twenty-one".