3664521 has 40 divisors (see below), whose sum is σ = 6551424. Its totient is φ = 1995840.

The previous prime is 3664519. The next prime is 3664547. The reversal of 3664521 is 1254663.

It is not a de Polignac number, because 3664521 - 2¹ = 3664519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3664561) 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 39 ways as a sum of consecutive naturals, for example, 12901 + ... + 13181.

Almost surely, 2^3664521 is an apocalyptic number.

It is an amenable number.

3664521 is a deficient number, since it is larger than the sum of its proper divisors (2886903).

3664521 is a wasteful number, since it uses less digits than its factorization.

3664521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 314 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 3664521 is about 1914.2938645882. The cubic root of 3664521 is about 154.1720823355.

The spelling of 3664521 in words is "three million, six hundred sixty-four thousand, five hundred twenty-one".