3921856 has 28 divisors (see below), whose sum is σ = 7845552. Its totient is φ = 1945088.

The previous prime is 3921851. The next prime is 3921859. The reversal of 3921856 is 6581293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921851) 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 3 ways as a sum of consecutive naturals, for example, 14781 + ... + 15043.

Almost surely, 2^3921856 is an apocalyptic number.

It is an amenable number.

3921856 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

3921856 is a wasteful number, since it uses less digits than its factorization.

3921856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508 (or 498 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 3921856 is about 1980.3676426361. The cubic root of 3921856 is about 157.6995840508.

The spelling of 3921856 in words is "three million, nine hundred twenty-one thousand, eight hundred fifty-six".