3984521 has 2 divisors, whose sum is σ = 3984522. Its totient is φ = 3984520.

The previous prime is 3984517. The next prime is 3984587. The reversal of 3984521 is 1254893.

3984521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3024121 + 960400 = 1739^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 3984521 - 2² = 3984517 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3980521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992260 + 1992261.

It is an arithmetic number, because the mean of its divisors is an integer number (1992261).

Almost surely, 2^3984521 is an apocalyptic number.

It is an amenable number.

3984521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3984521 is an equidigital number, since it uses as much as digits as its factorization.

3984521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 3984521 is about 1996.1264989975. The cubic root of 3984521 is about 158.5350789949.

The spelling of 3984521 in words is "three million, nine hundred eighty-four thousand, five hundred twenty-one".