3991149 has 12 divisors (see below), whose sum is σ = 5789056. Its totient is φ = 2649672.

The previous prime is 3991139. The next prime is 3991181. The reversal of 3991149 is 9411993.

It is not a de Polignac number, because 3991149 - 2⁷ = 3991021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1764 + ... + 3330.

Almost surely, 2^3991149 is an apocalyptic number.

It is an amenable number.

3991149 is a deficient number, since it is larger than the sum of its proper divisors (1797907).

3991149 is a wasteful number, since it uses less digits than its factorization.

3991149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856 (or 1853 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 3991149 is about 1997.7860245782. The cubic root of 3991149 is about 158.6229346753.

The spelling of 3991149 in words is "three million, nine hundred ninety-one thousand, one hundred forty-nine".