2781859 has 4 divisors (see below), whose sum is σ = 2786616. Its totient is φ = 2777104.

The previous prime is 2781853. The next prime is 2781887. The reversal of 2781859 is 9581872.

2781859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2781859 - 2⁷ = 2781731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2781853) 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 3 ways as a sum of consecutive naturals, for example, 1354 + ... + 2719.

It is an arithmetic number, because the mean of its divisors is an integer number (696654).

2^2781859 is an apocalyptic number.

2781859 is a deficient number, since it is larger than the sum of its proper divisors (4757).

2781859 is an equidigital number, since it uses as much as digits as its factorization.

2781859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4756.

The product of its digits is 40320, while the sum is 40.

The square root of 2781859 is about 1667.8905839413. The cubic root of 2781859 is about 140.6409219174.

The spelling of 2781859 in words is "two million, seven hundred eighty-one thousand, eight hundred fifty-nine".