2781873 has 24 divisors (see below), whose sum is σ = 4268160. Its totient is φ = 1742400.

The previous prime is 2781853. The next prime is 2781887. The reversal of 2781873 is 3781872.

2781873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2781873 - 2⁸ = 2781617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2781803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18348 + ... + 18498.

It is an arithmetic number, because the mean of its divisors is an integer number (177840).

2^2781873 is an apocalyptic number.

2781873 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2781873 is a deficient number, since it is larger than the sum of its proper divisors (1486287).

2781873 is a wasteful number, since it uses less digits than its factorization.

2781873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 266 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 2781873 is about 1667.8947808540. The cubic root of 2781873 is about 140.6411578471.

Subtracting 2781873 from its reverse (3781872), we obtain a palindrome (999999).

It can be divided in two parts, 2 and 781873, that added together give a triangular number (781875 = T₁₂₅₀).

The spelling of 2781873 in words is "two million, seven hundred eighty-one thousand, eight hundred seventy-three".