7964921 has 2 divisors, whose sum is σ = 7964922. Its totient is φ = 7964920.

The previous prime is 7964909. The next prime is 7964939. The reversal of 7964921 is 1294697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5125696 + 2839225 = 2264^2 + 1685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7964921 is a prime.

It is not a weakly prime, because it can be changed into another prime (7964951) 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, 3982460 + 3982461.

It is an arithmetic number, because the mean of its divisors is an integer number (3982461).

Almost surely, 2^7964921 is an apocalyptic number.

It is an amenable number.

7964921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7964921 is an equidigital number, since it uses as much as digits as its factorization.

7964921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 7964921 is about 2822.2191622906. The cubic root of 7964921 is about 199.7072466866.

The spelling of 7964921 in words is "seven million, nine hundred sixty-four thousand, nine hundred twenty-one".