3991244 has 6 divisors (see below), whose sum is σ = 6984684. Its totient is φ = 1995620.

The previous prime is 3991237. The next prime is 3991261. The reversal of 3991244 is 4421993.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991244.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 498902 + ... + 498909.

It is an arithmetic number, because the mean of its divisors is an integer number (1164114).

Almost surely, 2^3991244 is an apocalyptic number.

It is an amenable number.

3991244 is a deficient number, since it is larger than the sum of its proper divisors (2993440).

3991244 is a wasteful number, since it uses less digits than its factorization.

3991244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997815 (or 997813 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 3991244 is about 1997.8098007568. The cubic root of 3991244 is about 158.6241932151.

The spelling of 3991244 in words is "three million, nine hundred ninety-one thousand, two hundred forty-four".