3981556 has 12 divisors (see below), whose sum is σ = 7086240. Its totient is φ = 1956920.

The previous prime is 3981541. The next prime is 3981563. The reversal of 3981556 is 6551893.

3981556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×3981556² = 31705576362272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8200 + ... + 8671.

It is an arithmetic number, because the mean of its divisors is an integer number (590520).

Almost surely, 2^3981556 is an apocalyptic number.

It is an amenable number.

3981556 is a deficient number, since it is larger than the sum of its proper divisors (3104684).

3981556 is a wasteful number, since it uses less digits than its factorization.

3981556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16934 (or 16932 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 3981556 is about 1995.3836723798. The cubic root of 3981556 is about 158.4957456888.

It can be divided in two parts, 398155 and 6, that added together give a square (398161 = 631²).

The spelling of 3981556 in words is "three million, nine hundred eighty-one thousand, five hundred fifty-six".