2089805 has 4 divisors (see below), whose sum is σ = 2507772. Its totient is φ = 1671840.

The previous prime is 2089781. The next prime is 2089807. The reversal of 2089805 is 5089802.

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 1552516 + 537289 = 1246^2 + 733^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2089805 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2089807) 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, 208976 + ... + 208985.

It is an arithmetic number, because the mean of its divisors is an integer number (626943).

2^2089805 is an apocalyptic number.

It is an amenable number.

2089805 is a deficient number, since it is larger than the sum of its proper divisors (417967).

2089805 is an equidigital number, since it uses as much as digits as its factorization.

2089805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417966.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 2089805 is about 1445.6157857467. The cubic root of 2089805 is about 127.8503500087.

The spelling of 2089805 in words is "two million, eighty-nine thousand, eight hundred five".