3946721 has 2 divisors, whose sum is σ = 3946722. Its totient is φ = 3946720.

The previous prime is 3946681. The next prime is 3946727. The reversal of 3946721 is 1276493.

3946721 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., 2446096 + 1500625 = 1564^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3946721 - 2¹⁴ = 3930337 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3946727) 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, 1973360 + 1973361.

It is an arithmetic number, because the mean of its divisors is an integer number (1973361).

Almost surely, 2^3946721 is an apocalyptic number.

It is an amenable number.

3946721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3946721 is an equidigital number, since it uses as much as digits as its factorization.

3946721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 3946721 is about 1986.6355981911. The cubic root of 3946721 is about 158.0321597732.

The spelling of 3946721 in words is "three million, nine hundred forty-six thousand, seven hundred twenty-one".