3784221 has 18 divisors (see below), whose sum is σ = 6359262. Its totient is φ = 2162160.

The previous prime is 3784199. The next prime is 3784223. The reversal of 3784221 is 1224873.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 1863225 = 1386^2 + 1365^2 .

It is not a de Polignac number, because 3784221 - 2⁵ = 3784189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3784223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3850 + ... + 4731.

Almost surely, 2^3784221 is an apocalyptic number.

It is an amenable number.

3784221 is a deficient number, since it is larger than the sum of its proper divisors (2575041).

3784221 is a wasteful number, since it uses less digits than its factorization.

3784221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8601 (or 8591 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 3784221 is about 1945.3074307163. The cubic root of 3784221 is about 155.8327843372.

It can be divided in two parts, 3784 and 221, that added together give a triangular number (4005 = T₈₉).

The spelling of 3784221 in words is "three million, seven hundred eighty-four thousand, two hundred twenty-one".