2105849 has 4 divisors (see below), whose sum is σ = 2145636. Its totient is φ = 2066064.

The previous prime is 2105843. The next prime is 2105863. The reversal of 2105849 is 9485012.

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 1795600 + 310249 = 1340^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105849 - 2⁴ = 2105833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19814 + ... + 19919.

It is an arithmetic number, because the mean of its divisors is an integer number (536409).

2^2105849 is an apocalyptic number.

It is an amenable number.

2105849 is a deficient number, since it is larger than the sum of its proper divisors (39787).

2105849 is an equidigital number, since it uses as much as digits as its factorization.

2105849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39786.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2105849 is about 1451.1543680808. The cubic root of 2105849 is about 128.1766968855.

The spelling of 2105849 in words is "two million, one hundred five thousand, eight hundred forty-nine".