3622721 has 2 divisors, whose sum is σ = 3622722. Its totient is φ = 3622720.

The previous prime is 3622687. The next prime is 3622727. The reversal of 3622721 is 1272263.

3622721 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., 3474496 + 148225 = 1864^2 + 385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3622721 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 3² + 6⁶ + 2¹⁷ + 2¹⁹ + 7⁷ + 2²¹ + 1 .

It is not a weakly prime, because it can be changed into another prime (3622727) 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, 1811360 + 1811361.

It is an arithmetic number, because the mean of its divisors is an integer number (1811361).

Almost surely, 2^3622721 is an apocalyptic number.

It is an amenable number.

3622721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3622721 is an equidigital number, since it uses as much as digits as its factorization.

3622721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 3622721 is about 1903.3446876486. The cubic root of 3622721 is about 153.5836423055.

Adding to 3622721 its reverse (1272263), we get a palindrome (4894984).

The spelling of 3622721 in words is "three million, six hundred twenty-two thousand, seven hundred twenty-one".