2013665 has 8 divisors (see below), whose sum is σ = 2424168. Its totient is φ = 1605760.

The previous prime is 2013659. The next prime is 2013679. The reversal of 2013665 is 5663102.

It can be written as a sum of positive squares in 4 ways, for example, as 5776 + 2007889 = 76^2 + 1417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2013665 - 2⁸ = 2013409 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 2013665.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2219 + ... + 2991.

It is an arithmetic number, because the mean of its divisors is an integer number (303021).

2^2013665 is an apocalyptic number.

It is an amenable number.

2013665 is a deficient number, since it is larger than the sum of its proper divisors (410503).

2013665 is an equidigital number, since it uses as much as digits as its factorization.

2013665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2013665 is about 1419.0366450518. The cubic root of 2013665 is about 126.2784009562.

Adding to 2013665 its reverse (5663102), we get a palindrome (7676767).

The spelling of 2013665 in words is "two million, thirteen thousand, six hundred sixty-five".