3991075 has 24 divisors (see below), whose sum is σ = 5642496. Its totient is φ = 2772000.

The previous prime is 3991051. The next prime is 3991087. The reversal of 3991075 is 5701993.

It is not a de Polignac number, because 3991075 - 2¹³ = 3982883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991075.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6010 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (235104).

Almost surely, 2^3991075 is an apocalyptic number.

3991075 is a deficient number, since it is larger than the sum of its proper divisors (1651421).

3991075 is a wasteful number, since it uses less digits than its factorization.

3991075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 3991075 is about 1997.7675039904. The cubic root of 3991075 is about 158.6219543252.

The spelling of 3991075 in words is "three million, nine hundred ninety-one thousand, seventy-five".