3963221 has 2 divisors, whose sum is σ = 3963222. Its totient is φ = 3963220.

The previous prime is 3963209. The next prime is 3963241. The reversal of 3963221 is 1223693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 1276900 = 1639^2 + 1130^2 .

It is an emirp because it is prime and its reverse (1223693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3963221 - 2¹⁴ = 3946837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3963241) 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, 1981610 + 1981611.

It is an arithmetic number, because the mean of its divisors is an integer number (1981611).

Almost surely, 2^3963221 is an apocalyptic number.

It is an amenable number.

3963221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3963221 is an equidigital number, since it uses as much as digits as its factorization.

3963221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 3963221 is about 1990.7840164116. The cubic root of 3963221 is about 158.2520811794.

The spelling of 3963221 in words is "three million, nine hundred sixty-three thousand, two hundred twenty-one".