2780871 has 4 divisors (see below), whose sum is σ = 3707832. Its totient is φ = 1853912.

The previous prime is 2780837. The next prime is 2780873. The reversal of 2780871 is 1780872.

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 2780871 - 2¹¹ = 2778823 is a prime.

It is a D-number.

2780871 is a lucky number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 463476 + ... + 463481.

It is an arithmetic number, because the mean of its divisors is an integer number (926958).

2^2780871 is an apocalyptic number.

2780871 is a deficient number, since it is larger than the sum of its proper divisors (926961).

2780871 is an equidigital number, since it uses as much as digits as its factorization.

2780871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926960.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 2780871 is about 1667.5943751404. The cubic root of 2780871 is about 140.6242700209.

Subtracting from 2780871 its reverse (1780872), we obtain a palindrome (999999).

The spelling of 2780871 in words is "two million, seven hundred eighty thousand, eight hundred seventy-one".