3938521 has 2 divisors, whose sum is σ = 3938522. Its totient is φ = 3938520.

The previous prime is 3938513. The next prime is 3938527. The reversal of 3938521 is 1258393.

It is a happy number.

3938521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3857296 + 81225 = 1964^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 3938521 - 2³ = 3938513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3938527) 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, 1969260 + 1969261.

It is an arithmetic number, because the mean of its divisors is an integer number (1969261).

Almost surely, 2^3938521 is an apocalyptic number.

It is an amenable number.

3938521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3938521 is an equidigital number, since it uses as much as digits as its factorization.

3938521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 3938521 is about 1984.5707344411. The cubic root of 3938521 is about 157.9226374458.

The spelling of 3938521 in words is "three million, nine hundred thirty-eight thousand, five hundred twenty-one".