3081805 has 4 divisors (see below), whose sum is σ = 3698172. Its totient is φ = 2465440.

The previous prime is 3081797. The next prime is 3081809. The reversal of 3081805 is 5081803.

3081805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2196324 + 885481 = 1482^2 + 941^2 .

It is not a de Polignac number, because 3081805 - 2³ = 3081797 is a prime.

It is a Duffinian number.

3081805 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3081805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3081809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308176 + ... + 308185.

It is an arithmetic number, because the mean of its divisors is an integer number (924543).

Almost surely, 2^3081805 is an apocalyptic number.

It is an amenable number.

3081805 is a deficient number, since it is larger than the sum of its proper divisors (616367).

3081805 is an equidigital number, since it uses as much as digits as its factorization.

3081805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616366.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 3081805 is about 1755.5070492596. The cubic root of 3081805 is about 145.5241434804.

The spelling of 3081805 in words is "three million, eighty-one thousand, eight hundred five".