2781723 has 16 divisors (see below), whose sum is σ = 4376576. Its totient is φ = 1537920.

The previous prime is 2781707. The next prime is 2781731. The reversal of 2781723 is 3271872.

2781723 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 2781723 - 2⁴ = 2781707 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2781723 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2781703) 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 15 ways as a sum of consecutive naturals, for example, 1486 + ... + 2787.

It is an arithmetic number, because the mean of its divisors is an integer number (273536).

2^2781723 is an apocalyptic number.

2781723 is a deficient number, since it is larger than the sum of its proper divisors (1594853).

2781723 is a wasteful number, since it uses less digits than its factorization.

2781723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314.

The product of its digits is 4704, while the sum is 30.

The square root of 2781723 is about 1667.8498133825. The cubic root of 2781723 is about 140.6386299875.

The spelling of 2781723 in words is "two million, seven hundred eighty-one thousand, seven hundred twenty-three".