2705665 has 4 divisors (see below), whose sum is σ = 3246804. Its totient is φ = 2164528.

The previous prime is 2705663. The next prime is 2705687. The reversal of 2705665 is 5665072.

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 1971216 + 734449 = 1404^2 + 857^2 .

It is a cyclic number.

It is not a de Polignac number, because 2705665 - 2¹ = 2705663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2705663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270562 + ... + 270571.

It is an arithmetic number, because the mean of its divisors is an integer number (811701).

2^2705665 is an apocalyptic number.

It is an amenable number.

2705665 is a deficient number, since it is larger than the sum of its proper divisors (541139).

2705665 is an equidigital number, since it uses as much as digits as its factorization.

2705665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541138.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 2705665 is about 1644.8905738681. The cubic root of 2705665 is about 139.3449843868.

The spelling of 2705665 in words is "two million, seven hundred five thousand, six hundred sixty-five".