2805985 has 24 divisors (see below), whose sum is σ = 4223016. Its totient is φ = 1774080.

The previous prime is 2805973. The next prime is 2805989. The reversal of 2805985 is 5895082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7056 + 2798929 = 84^2 + 1673^2 .

It is not a de Polignac number, because 2805985 - 2¹¹ = 2803937 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2805989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2745 + ... + 3625.

It is an arithmetic number, because the mean of its divisors is an integer number (175959).

2^2805985 is an apocalyptic number.

It is an amenable number.

2805985 is a deficient number, since it is larger than the sum of its proper divisors (1417031).

2805985 is a wasteful number, since it uses less digits than its factorization.

2805985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 2805985 is about 1675.1074592396. The cubic root of 2805985 is about 141.0463271810.

The spelling of 2805985 in words is "two million, eight hundred five thousand, nine hundred eighty-five".