3221604 has 36 divisors (see below), whose sum is σ = 8228220. Its totient is φ = 1062720.

The previous prime is 3221599. The next prime is 3221629. The reversal of 3221604 is 4061223.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1557504 + 1664100 = 1248^2 + 1290^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3514 + ... + 4334.

Almost surely, 2^3221604 is an apocalyptic number.

It is an amenable number.

3221604 is an abundant number, since it is smaller than the sum of its proper divisors (5006616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3221604 is a wasteful number, since it uses less digits than its factorization.

3221604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 935 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3221604 is about 1794.8827259740. The cubic root of 3221604 is about 147.6921406749.

Adding to 3221604 its reverse (4061223), we get a palindrome (7282827).

The spelling of 3221604 in words is "three million, two hundred twenty-one thousand, six hundred four".