3921604 has 6 divisors (see below), whose sum is σ = 6862814. Its totient is φ = 1960800.

The previous prime is 3921601. The next prime is 3921637. The reversal of 3921604 is 4061293.

It can be written as a sum of positive squares in only one way, i.e., 2408704 + 1512900 = 1552^2 + 1230^2 .

It is not an unprimeable number, because it can be changed into a prime (3921601) 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, 490197 + ... + 490204.

Almost surely, 2^3921604 is an apocalyptic number.

It is an amenable number.

3921604 is a deficient number, since it is larger than the sum of its proper divisors (2941210).

3921604 is a wasteful number, since it uses less digits than its factorization.

3921604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980405 (or 980403 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 3921604 is about 1980.3040170640. The cubic root of 3921604 is about 157.6962063009.

Adding to 3921604 its reverse (4061293), we get a palindrome (7982897).

The spelling of 3921604 in words is "three million, nine hundred twenty-one thousand, six hundred four".