2103905 has 4 divisors (see below), whose sum is σ = 2524692. Its totient is φ = 1683120.

The previous prime is 2103901. The next prime is 2103911. The reversal of 2103905 is 5093012.

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 952576 + 1151329 = 976^2 + 1073^2 .

It is not a de Polignac number, because 2103905 - 2² = 2103901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2103901) 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, 210386 + ... + 210395.

It is an arithmetic number, because the mean of its divisors is an integer number (631173).

2^2103905 is an apocalyptic number.

It is an amenable number.

2103905 is a deficient number, since it is larger than the sum of its proper divisors (420787).

2103905 is an equidigital number, since it uses as much as digits as its factorization.

2103905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420786.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 2103905 is about 1450.4844018465. The cubic root of 2103905 is about 128.1372429308.

Adding to 2103905 its reverse (5093012), we get a palindrome (7196917).

The spelling of 2103905 in words is "two million, one hundred three thousand, nine hundred five".