2861665 has 4 divisors (see below), whose sum is σ = 3434004. Its totient is φ = 2289328.

The previous prime is 2861659. The next prime is 2861669. The reversal of 2861665 is 5661682.

2861665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 853776 + 2007889 = 924^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 2861665 - 2³ = 2861657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2861665.

It is not an unprimeable number, because it can be changed into a prime (2861669) 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 3 ways as a sum of consecutive naturals, for example, 286162 + ... + 286171.

It is an arithmetic number, because the mean of its divisors is an integer number (858501).

2^2861665 is an apocalyptic number.

It is an amenable number.

2861665 is a deficient number, since it is larger than the sum of its proper divisors (572339).

2861665 is an equidigital number, since it uses as much as digits as its factorization.

2861665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572338.

The product of its digits is 17280, while the sum is 34.

The square root of 2861665 is about 1691.6456484737. The cubic root of 2861665 is about 141.9731649350.

The spelling of 2861665 in words is "two million, eight hundred sixty-one thousand, six hundred sixty-five".