2685905 has 4 divisors (see below), whose sum is σ = 3223092. Its totient is φ = 2148720.

The previous prime is 2685901. The next prime is 2685911. The reversal of 2685905 is 5095862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 817216 + 1868689 = 904^2 + 1367^2 .

It is not a de Polignac number, because 2685905 - 2² = 2685901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2685901) 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 3 ways as a sum of consecutive naturals, for example, 268586 + ... + 268595.

It is an arithmetic number, because the mean of its divisors is an integer number (805773).

2^2685905 is an apocalyptic number.

It is an amenable number.

2685905 is a deficient number, since it is larger than the sum of its proper divisors (537187).

2685905 is an equidigital number, since it uses as much as digits as its factorization.

2685905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537186.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 2685905 is about 1638.8730884361. The cubic root of 2685905 is about 139.0049340070.

The spelling of 2685905 in words is "two million, six hundred eighty-five thousand, nine hundred five".