327721 has 2 divisors, whose sum is σ = 327722. Its totient is φ = 327720.

The previous prime is 327707. The next prime is 327737. The reversal of 327721 is 127723.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176400 + 151321 = 420^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 327721 - 2⁵ = 327689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 327692 and 327701.

It is not a weakly prime, because it can be changed into another prime (327421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163860 + 163861.

It is an arithmetic number, because the mean of its divisors is an integer number (163861).

2³²⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

327721 is a deficient number, since it is larger than the sum of its proper divisors (1).

327721 is an equidigital number, since it uses as much as digits as its factorization.

327721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 22.

The square root of 327721 is about 572.4692131460. The cubic root of 327721 is about 68.9447853459.

The spelling of 327721 in words is "three hundred twenty-seven thousand, seven hundred twenty-one", and thus it is an iban number.