3921556 has 12 divisors (see below), whose sum is σ = 7048468. Its totient is φ = 1907712.

The previous prime is 3921551. The next prime is 3921559. The reversal of 3921556 is 6551293.

It can be written as a sum of positive squares in 2 ways, for example, as 3549456 + 372100 = 1884^2 + 610^2 .

It is a super-2 number, since 2×3921556² = 30757202922272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921551) 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, 13101 + ... + 13396.

Almost surely, 2^3921556 is an apocalyptic number.

It is an amenable number.

3921556 is a deficient number, since it is larger than the sum of its proper divisors (3126912).

3921556 is a wasteful number, since it uses less digits than its factorization.

3921556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26538 (or 26536 counting only the distinct ones).

The product of its digits is 8100, while the sum is 31.

The square root of 3921556 is about 1980.2918976757. The cubic root of 3921556 is about 157.6955629036.

The spelling of 3921556 in words is "three million, nine hundred twenty-one thousand, five hundred fifty-six".