2049805 has 4 divisors (see below), whose sum is σ = 2459772. Its totient is φ = 1639840.

The previous prime is 2049797. The next prime is 2049821. The reversal of 2049805 is 5089402.

It is a happy number.

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 1590121 + 459684 = 1261^2 + 678^2 .

It is not a de Polignac number, because 2049805 - 2³ = 2049797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204976 + ... + 204985.

It is an arithmetic number, because the mean of its divisors is an integer number (614943).

2^2049805 is an apocalyptic number.

It is an amenable number.

2049805 is a deficient number, since it is larger than the sum of its proper divisors (409967).

2049805 is an equidigital number, since it uses as much as digits as its factorization.

2049805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409966.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2049805 is about 1431.7140077543. The cubic root of 2049805 is about 127.0293812609.

The spelling of 2049805 in words is "two million, forty-nine thousand, eight hundred five".