2840891 has 4 divisors (see below), whose sum is σ = 2964432. Its totient is φ = 2717352.

The previous prime is 2840857. The next prime is 2840911. The reversal of 2840891 is 1980482.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2840891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2840801) 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, 61736 + ... + 61781.

It is an arithmetic number, because the mean of its divisors is an integer number (741108).

2^2840891 is an apocalyptic number.

2840891 is a deficient number, since it is larger than the sum of its proper divisors (123541).

2840891 is a wasteful number, since it uses less digits than its factorization.

2840891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123540.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 2840891 is about 1685.4942895187. The cubic root of 2840891 is about 141.6287831037.

The spelling of 2840891 in words is "two million, eight hundred forty thousand, eight hundred ninety-one".