7327921 has 2 divisors, whose sum is σ = 7327922. Its totient is φ = 7327920.

The previous prime is 7327909. The next prime is 7327933. The reversal of 7327921 is 1297237.

It is a balanced prime because it is at equal distance from previous prime (7327909) and next prime (7327933).

It can be written as a sum of positive squares in only one way, i.e., 5475600 + 1852321 = 2340^2 + 1361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7327921 is a prime.

It is not a weakly prime, because it can be changed into another prime (7327121) 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, 3663960 + 3663961.

It is an arithmetic number, because the mean of its divisors is an integer number (3663961).

Almost surely, 2^7327921 is an apocalyptic number.

It is an amenable number.

7327921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7327921 is an equidigital number, since it uses as much as digits as its factorization.

7327921 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7327921 is about 2707.0132988222. The cubic root of 7327921 is about 194.2347478924.

The spelling of 7327921 in words is "seven million, three hundred twenty-seven thousand, nine hundred twenty-one".