2805305 has 4 divisors (see below), whose sum is σ = 3366372. Its totient is φ = 2244240.

The previous prime is 2805263. The next prime is 2805311. The reversal of 2805305 is 5035082.

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 1507984 + 1297321 = 1228^2 + 1139^2 .

It is not a de Polignac number, because 2805305 - 2¹⁶ = 2739769 is a prime.

It is a super-2 number, since 2×2805305² = 15739472286050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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, 280526 + ... + 280535.

It is an arithmetic number, because the mean of its divisors is an integer number (841593).

2^2805305 is an apocalyptic number.

It is an amenable number.

2805305 is a deficient number, since it is larger than the sum of its proper divisors (561067).

2805305 is an equidigital number, since it uses as much as digits as its factorization.

2805305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561066.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2805305 is about 1674.9044748880. The cubic root of 2805305 is about 141.0349325785.

The spelling of 2805305 in words is "two million, eight hundred five thousand, three hundred five".