2783891 has 4 divisors (see below), whose sum is σ = 3036984. Its totient is φ = 2530800.

The previous prime is 2783887. The next prime is 2783909. The reversal of 2783891 is 1983872.

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 2783891 - 2² = 2783887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2783821) 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, 126530 + ... + 126551.

It is an arithmetic number, because the mean of its divisors is an integer number (759246).

2^2783891 is an apocalyptic number.

2783891 is a deficient number, since it is larger than the sum of its proper divisors (253093).

2783891 is a wasteful number, since it uses less digits than its factorization.

2783891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253092.

The product of its digits is 24192, while the sum is 38.

The square root of 2783891 is about 1668.4996254120. The cubic root of 2783891 is about 140.6751571534.

The spelling of 2783891 in words is "two million, seven hundred eighty-three thousand, eight hundred ninety-one".