3009805 has 4 divisors (see below), whose sum is σ = 3611772. Its totient is φ = 2407840.

The previous prime is 3009781. The next prime is 3009827. The reversal of 3009805 is 5089003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5089003 = 23 ⋅221261.

It can be written as a sum of positive squares in 2 ways, for example, as 1444804 + 1565001 = 1202^2 + 1251^2 .

It is not a de Polignac number, because 3009805 - 2¹³ = 3001613 is a prime.

It is a super-2 number, since 2×3009805² = 18117852276050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3009805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300976 + ... + 300985.

It is an arithmetic number, because the mean of its divisors is an integer number (902943).

Almost surely, 2^3009805 is an apocalyptic number.

It is an amenable number.

3009805 is a deficient number, since it is larger than the sum of its proper divisors (601967).

3009805 is an equidigital number, since it uses as much as digits as its factorization.

3009805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601966.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 3009805 is about 1734.8789583138. The cubic root of 3009805 is about 144.3819112400.

The spelling of 3009805 in words is "three million, nine thousand, eight hundred five".