2780843 has 8 divisors (see below), whose sum is σ = 3171168. Its totient is φ = 2415744.

The previous prime is 2780837. The next prime is 2780873. The reversal of 2780843 is 3480872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2780843 - 2⁶ = 2780779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780873) 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 7 ways as a sum of consecutive naturals, for example, 6071 + ... + 6512.

It is an arithmetic number, because the mean of its divisors is an integer number (396396).

2^2780843 is an apocalyptic number.

2780843 is a deficient number, since it is larger than the sum of its proper divisors (390325).

2780843 is a wasteful number, since it uses less digits than its factorization.

2780843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12613.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 2780843 is about 1667.5859797923. The cubic root of 2780843 is about 140.6237980473.

The spelling of 2780843 in words is "two million, seven hundred eighty thousand, eight hundred forty-three".