12736509 has 8 divisors (see below), whose sum is σ = 17038560. Its totient is φ = 8462736.

The previous prime is 12736489. The next prime is 12736543. The reversal of 12736509 is 90563721.

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

It is not a de Polignac number, because 12736509 - 2⁸ = 12736253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12736509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12736579) 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, 5994 + ... + 7835.

It is an arithmetic number, because the mean of its divisors is an integer number (2129820).

Almost surely, 2^12736509 is an apocalyptic number.

It is an amenable number.

12736509 is a deficient number, since it is larger than the sum of its proper divisors (4302051).

12736509 is a wasteful number, since it uses less digits than its factorization.

12736509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14139.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 12736509 is about 3568.8245964183. The cubic root of 12736509 is about 233.5340094471.

The spelling of 12736509 in words is "twelve million, seven hundred thirty-six thousand, five hundred nine".