3981566 has 8 divisors (see below), whose sum is σ = 6054384. Its totient is φ = 1963440.

The previous prime is 3981563. The next prime is 3981569. The reversal of 3981566 is 6651893.

It is an interprime number because it is at equal distance from previous prime (3981563) and next prime (3981569).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981563) 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, 13490 + ... + 13781.

It is an arithmetic number, because the mean of its divisors is an integer number (756798).

Almost surely, 2^3981566 is an apocalyptic number.

3981566 is a deficient number, since it is larger than the sum of its proper divisors (2072818).

3981566 is a wasteful number, since it uses less digits than its factorization.

3981566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27346.

The product of its digits is 38880, while the sum is 38.

The square root of 3981566 is about 1995.3861781620. The cubic root of 3981566 is about 158.4958783804.

The spelling of 3981566 in words is "three million, nine hundred eighty-one thousand, five hundred sixty-six".