12688523 has 4 divisors (see below), whose sum is σ = 13356360. Its totient is φ = 12020688.

The previous prime is 12688513. The next prime is 12688531. The reversal of 12688523 is 32588621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12688523 - 2¹⁴ = 12672139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12688513) 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 3 ways as a sum of consecutive naturals, for example, 333890 + ... + 333927.

It is an arithmetic number, because the mean of its divisors is an integer number (3339090).

Almost surely, 2^12688523 is an apocalyptic number.

12688523 is a deficient number, since it is larger than the sum of its proper divisors (667837).

12688523 is an equidigital number, since it uses as much as digits as its factorization.

12688523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667836.

The product of its digits is 23040, while the sum is 35.

The square root of 12688523 is about 3562.0953103475. The cubic root of 12688523 is about 233.2403532030.

The spelling of 12688523 in words is "twelve million, six hundred eighty-eight thousand, five hundred twenty-three".