3921566 has 16 divisors (see below), whose sum is σ = 6447600. Its totient is φ = 1774080.

The previous prime is 3921559. The next prime is 3921601. The reversal of 3921566 is 6651293.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8510 + ... + 8958.

It is an arithmetic number, because the mean of its divisors is an integer number (402975).

Almost surely, 2^3921566 is an apocalyptic number.

3921566 is a deficient number, since it is larger than the sum of its proper divisors (2526034).

3921566 is a wasteful number, since it uses less digits than its factorization.

3921566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 9720, while the sum is 32.

The square root of 3921566 is about 1980.2944225544. The cubic root of 3921566 is about 157.6956969451.

The spelling of 3921566 in words is "three million, nine hundred twenty-one thousand, five hundred sixty-six".