7980821 has 2 divisors, whose sum is σ = 7980822. Its totient is φ = 7980820.

The previous prime is 7980811. The next prime is 7980859. The reversal of 7980821 is 1280897.

It is a happy number.

7980821 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., 7980625 + 196 = 2825^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 7980821 - 2¹⁸ = 7718677 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 (7980811) 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 as a sum of consecutive naturals, namely, 3990410 + 3990411.

It is an arithmetic number, because the mean of its divisors is an integer number (3990411).

Almost surely, 2^7980821 is an apocalyptic number.

It is an amenable number.

7980821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7980821 is an equidigital number, since it uses as much as digits as its factorization.

7980821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 7980821 is about 2825.0346900525. The cubic root of 7980821 is about 199.8400471095.

The spelling of 7980821 in words is "seven million, nine hundred eighty thousand, eight hundred twenty-one".