3916621 has 2 divisors, whose sum is σ = 3916622. Its totient is φ = 3916620.

The previous prime is 3916609. The next prime is 3916631. The reversal of 3916621 is 1266193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3880900 + 35721 = 1970^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 3916621 - 2¹⁷ = 3785549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3916621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3916631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1958310 + 1958311.

It is an arithmetic number, because the mean of its divisors is an integer number (1958311).

Almost surely, 2^3916621 is an apocalyptic number.

It is an amenable number.

3916621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3916621 is an equidigital number, since it uses as much as digits as its factorization.

3916621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 3916621 is about 1979.0454769914. The cubic root of 3916621 is about 157.6293855767.

The spelling of 3916621 in words is "three million, nine hundred sixteen thousand, six hundred twenty-one".