3982245721 has 2 divisors, whose sum is σ = 3982245722. Its totient is φ = 3982245720.

The previous prime is 3982245713. The next prime is 3982245763. The reversal of 3982245721 is 1275422893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3889393225 + 92852496 = 62365^2 + 9636^2 .

It is a cyclic number.

It is not a de Polignac number, because 3982245721 - 2³ = 3982245713 is a prime.

It is not a weakly prime, because it can be changed into another prime (3982245221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1991122860 + 1991122861.

It is an arithmetic number, because the mean of its divisors is an integer number (1991122861).

Almost surely, 2^3982245721 is an apocalyptic number.

It is an amenable number.

3982245721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3982245721 is an equidigital number, since it uses as much as digits as its factorization.

3982245721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 3982245721 is about 63105.0372078173. The cubic root of 3982245721 is about 1585.0489718074.

The spelling of 3982245721 in words is "three billion, nine hundred eighty-two million, two hundred forty-five thousand, seven hundred twenty-one".