2781885 has 32 divisors (see below), whose sum is σ = 4815360. Its totient is φ = 1366848.

The previous prime is 2781853. The next prime is 2781887. The reversal of 2781885 is 5881872.

It is not a de Polignac number, because 2781885 - 2⁵ = 2781853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781887) 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 31 ways as a sum of consecutive naturals, for example, 12142 + ... + 12368.

It is an arithmetic number, because the mean of its divisors is an integer number (150480).

2^2781885 is an apocalyptic number.

2781885 is the 1362-nd pentagonal number.

It is an amenable number.

2781885 is a deficient number, since it is larger than the sum of its proper divisors (2033475).

2781885 is a wasteful number, since it uses less digits than its factorization.

2781885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297.

The product of its digits is 35840, while the sum is 39.

The square root of 2781885 is about 1667.8983781993. The cubic root of 2781885 is about 140.6413600719.

The spelling of 2781885 in words is "two million, seven hundred eighty-one thousand, eight hundred eighty-five".