2780309 has 12 divisors (see below), whose sum is σ = 3376224. Its totient is φ = 2278584.

The previous prime is 2780303. The next prime is 2780329. The reversal of 2780309 is 9030872.

2780309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2780309 - 2⁸ = 2780053 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 (2780303) 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 11 ways as a sum of consecutive naturals, for example, 107 + ... + 2360.

It is an arithmetic number, because the mean of its divisors is an integer number (281352).

2^2780309 is an apocalyptic number.

It is an amenable number.

2780309 is a deficient number, since it is larger than the sum of its proper divisors (595915).

2780309 is a wasteful number, since it uses less digits than its factorization.

2780309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2780309 is about 1667.4258604208. The cubic root of 2780309 is about 140.6147962308.

The spelling of 2780309 in words is "two million, seven hundred eighty thousand, three hundred nine".