3964521 has 16 divisors (see below), whose sum is σ = 6071040. Its totient is φ = 2275920.

The previous prime is 3964517. The next prime is 3964523. The reversal of 3964521 is 1254693.

It is not a de Polignac number, because 3964521 - 2² = 3964517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3964523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2535 + ... + 3788.

It is an arithmetic number, because the mean of its divisors is an integer number (379440).

Almost surely, 2^3964521 is an apocalyptic number.

It is an amenable number.

3964521 is a deficient number, since it is larger than the sum of its proper divisors (2106519).

3964521 is a wasteful number, since it uses less digits than its factorization.

3964521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356.

The product of its digits is 6480, while the sum is 30.

The square root of 3964521 is about 1991.1104941715. The cubic root of 3964521 is about 158.2693823608.

The spelling of 3964521 in words is "three million, nine hundred sixty-four thousand, five hundred twenty-one".