7328821 has 2 divisors, whose sum is σ = 7328822. Its totient is φ = 7328820.

The previous prime is 7328807. The next prime is 7328831. The reversal of 7328821 is 1288237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5340721 + 1988100 = 2311^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 7328821 - 2⁷ = 7328693 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 (7328801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3664410 + 3664411.

It is an arithmetic number, because the mean of its divisors is an integer number (3664411).

Almost surely, 2^7328821 is an apocalyptic number.

It is an amenable number.

7328821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7328821 is an equidigital number, since it uses as much as digits as its factorization.

7328821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 7328821 is about 2707.1795285869. The cubic root of 7328821 is about 194.2426994027.

The spelling of 7328821 in words is "seven million, three hundred twenty-eight thousand, eight hundred twenty-one".