12540309 has 8 divisors (see below), whose sum is σ = 16744320. Its totient is φ = 8348256.

The previous prime is 12540263. The next prime is 12540317. The reversal of 12540309 is 90304521.

12540309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12540309 - 2⁷ = 12540181 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157 + ... + 5010.

It is an arithmetic number, because the mean of its divisors is an integer number (2093040).

Almost surely, 2^12540309 is an apocalyptic number.

It is an amenable number.

12540309 is a deficient number, since it is larger than the sum of its proper divisors (4204011).

12540309 is an equidigital number, since it uses as much as digits as its factorization.

12540309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5979.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 12540309 is about 3541.2298711041. The cubic root of 12540309 is about 232.3286377488.

The spelling of 12540309 in words is "twelve million, five hundred forty thousand, three hundred nine".