2071805 has 4 divisors (see below), whose sum is σ = 2486172. Its totient is φ = 1657440.

The previous prime is 2071801. The next prime is 2071819. The reversal of 2071805 is 5081702.

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 1466521 + 605284 = 1211^2 + 778^2 .

It is not a de Polignac number, because 2071805 - 2² = 2071801 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 (2071801) 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, 207176 + ... + 207185.

It is an arithmetic number, because the mean of its divisors is an integer number (621543).

2^2071805 is an apocalyptic number.

It is an amenable number.

2071805 is a deficient number, since it is larger than the sum of its proper divisors (414367).

2071805 is an equidigital number, since it uses as much as digits as its factorization.

2071805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414366.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 2071805 is about 1439.3766011715. The cubic root of 2071805 is about 127.4822223067.

The spelling of 2071805 in words is "two million, seventy-one thousand, eight hundred five".