3991449 has 32 divisors (see below), whose sum is σ = 6829056. Its totient is φ = 2013120.

The previous prime is 3991441. The next prime is 3991451. The reversal of 3991449 is 9441993.

It is not a de Polignac number, because 3991449 - 2³ = 3991441 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3991441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8314 + ... + 8780.

It is an arithmetic number, because the mean of its divisors is an integer number (213408).

Almost surely, 2^3991449 is an apocalyptic number.

It is an amenable number.

3991449 is a deficient number, since it is larger than the sum of its proper divisors (2837607).

3991449 is a wasteful number, since it uses less digits than its factorization.

3991449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525.

The product of its digits is 34992, while the sum is 39.

The square root of 3991449 is about 1997.8611062834. The cubic root of 3991449 is about 158.6269089434.

The spelling of 3991449 in words is "three million, nine hundred ninety-one thousand, four hundred forty-nine".