3905521 has 4 divisors (see below), whose sum is σ = 3914352. Its totient is φ = 3896692.

The previous prime is 3905513. The next prime is 3905527. The reversal of 3905521 is 1255093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3905521 - 2³ = 3905513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3905527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3715 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (978588).

Almost surely, 2^3905521 is an apocalyptic number.

It is an amenable number.

3905521 is a deficient number, since it is larger than the sum of its proper divisors (8831).

3905521 is an equidigital number, since it uses as much as digits as its factorization.

3905521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8830.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 3905521 is about 1976.2391049668. The cubic root of 3905521 is about 157.4803334813.

The spelling of 3905521 in words is "three million, nine hundred five thousand, five hundred twenty-one".