3990811 has 4 divisors (see below), whose sum is σ = 4353624. Its totient is φ = 3628000.

The previous prime is 3990773. The next prime is 3990827. The reversal of 3990811 is 1180993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3990811 - 2¹¹ = 3988763 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3990841) 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, 181390 + ... + 181411.

It is an arithmetic number, because the mean of its divisors is an integer number (1088406).

Almost surely, 2^3990811 is an apocalyptic number.

3990811 is a deficient number, since it is larger than the sum of its proper divisors (362813).

3990811 is a wasteful number, since it uses less digits than its factorization.

3990811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362812.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 3990811 is about 1997.7014291430. The cubic root of 3990811 is about 158.6184567614.

The spelling of 3990811 in words is "three million, nine hundred ninety thousand, eight hundred eleven".