327406721 has 2 divisors, whose sum is σ = 327406722. Its totient is φ = 327406720.

The previous prime is 327406699. The next prime is 327406733. The reversal of 327406721 is 127604723.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324720400 + 2686321 = 18020^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 327406721 - 2⁶ = 327406657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (327406741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163703360 + 163703361.

It is an arithmetic number, because the mean of its divisors is an integer number (163703361).

Almost surely, 2^327406721 is an apocalyptic number.

It is an amenable number.

327406721 is a deficient number, since it is larger than the sum of its proper divisors (1).

327406721 is an equidigital number, since it uses as much as digits as its factorization.

327406721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 327406721 is about 18094.3836866581. The cubic root of 327406721 is about 689.2273932888.

The spelling of 327406721 in words is "three hundred twenty-seven million, four hundred six thousand, seven hundred twenty-one".