2840305 has 16 divisors (see below), whose sum is σ = 3772944. Its totient is φ = 2039040.

The previous prime is 2840303. The next prime is 2840353. The reversal of 2840305 is 5030482.

It can be written as a sum of positive squares in 8 ways, for example, as 121104 + 2719201 = 348^2 + 1649^2 .

It is not a de Polignac number, because 2840305 - 2¹ = 2840303 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 (2840303) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1815 + ... + 2995.

It is an arithmetic number, because the mean of its divisors is an integer number (235809).

2^2840305 is an apocalyptic number.

It is an amenable number.

2840305 is a deficient number, since it is larger than the sum of its proper divisors (932639).

2840305 is a wasteful number, since it uses less digits than its factorization.

2840305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2840305 is about 1685.3204443073. The cubic root of 2840305 is about 141.6190443546.

Adding to 2840305 its reverse (5030482), we get a palindrome (7870787).

The spelling of 2840305 in words is "two million, eight hundred forty thousand, three hundred five".