2520309 has 24 divisors (see below), whose sum is σ = 3792096. Its totient is φ = 1487200.

The previous prime is 2520283. The next prime is 2520313. The reversal of 2520309 is 9030252.

It is not a de Polignac number, because 2520309 - 2⁵ = 2520277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520319) 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 23 ways as a sum of consecutive naturals, for example, 19174 + ... + 19304.

It is an arithmetic number, because the mean of its divisors is an integer number (158004).

2^2520309 is an apocalyptic number.

It is an amenable number.

2520309 is a deficient number, since it is larger than the sum of its proper divisors (1271787).

2520309 is a wasteful number, since it uses less digits than its factorization.

2520309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 2520309 is about 1587.5481095072. The cubic root of 2520309 is about 136.0874041670.

The spelling of 2520309 in words is "two million, five hundred twenty thousand, three hundred nine".