3820221 has 12 divisors (see below), whose sum is σ = 5571072. Its totient is φ = 2522376.

The previous prime is 3820181. The next prime is 3820237. The reversal of 3820221 is 1220283.

It is a happy number.

It is not a de Polignac number, because 3820221 - 2⁹ = 3819709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3820194 and 3820203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3820321) 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 in 11 ways as a sum of consecutive naturals, for example, 1021 + ... + 2946.

It is an arithmetic number, because the mean of its divisors is an integer number (464256).

Almost surely, 2^3820221 is an apocalyptic number.

It is an amenable number.

3820221 is a deficient number, since it is larger than the sum of its proper divisors (1750851).

3820221 is a wasteful number, since it uses less digits than its factorization.

3820221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080 (or 4077 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 3820221 is about 1954.5385644699. The cubic root of 3820221 is about 156.3253810141.

The spelling of 3820221 in words is "three million, eight hundred twenty thousand, two hundred twenty-one".