2103665 has 8 divisors (see below), whose sum is σ = 2673000. Its totient is φ = 1583872.

The previous prime is 2103653. The next prime is 2103667. The reversal of 2103665 is 5663012.

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 1024144 = 1039^2 + 1012^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2103665 - 2⁶ = 2103601 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2103665.

It is not an unprimeable number, because it can be changed into a prime (2103667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12290 + ... + 12459.

It is an arithmetic number, because the mean of its divisors is an integer number (334125).

2^2103665 is an apocalyptic number.

It is an amenable number.

2103665 is a deficient number, since it is larger than the sum of its proper divisors (569335).

2103665 is a wasteful number, since it uses less digits than its factorization.

2103665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24771.

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

The square root of 2103665 is about 1450.4016685043. The cubic root of 2103665 is about 128.1323703870.

Adding to 2103665 its reverse (5663012), we get a palindrome (7766677).

The spelling of 2103665 in words is "two million, one hundred three thousand, six hundred sixty-five".