2040891 has 4 divisors (see below), whose sum is σ = 2721192. Its totient is φ = 1360592.

The previous prime is 2040851. The next prime is 2040917. The reversal of 2040891 is 1980402.

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 2040891 - 2⁶ = 2040827 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2040851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340146 + ... + 340151.

It is an arithmetic number, because the mean of its divisors is an integer number (680298).

2^2040891 is an apocalyptic number.

2040891 is a deficient number, since it is larger than the sum of its proper divisors (680301).

2040891 is an equidigital number, since it uses as much as digits as its factorization.

2040891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680300.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2040891 is about 1428.5975640466. The cubic root of 2040891 is about 126.8449758685.

The spelling of 2040891 in words is "two million, forty thousand, eight hundred ninety-one".