12688491 has 8 divisors (see below), whose sum is σ = 16981504. Its totient is φ = 8427240.

The previous prime is 12688471. The next prime is 12688513. The reversal of 12688491 is 19488621.

12688491 is digitally balanced in base 2 and base 4, because in such bases 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 12688491 - 2¹⁸ = 12426347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12688411) 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, 6991 + ... + 8616.

It is an arithmetic number, because the mean of its divisors is an integer number (2122688).

Almost surely, 2^12688491 is an apocalyptic number.

12688491 is a deficient number, since it is larger than the sum of its proper divisors (4293013).

12688491 is a wasteful number, since it uses less digits than its factorization.

12688491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15881.

The product of its digits is 27648, while the sum is 39.

The square root of 12688491 is about 3562.0908186064. The cubic root of 12688491 is about 233.2401571283.

The spelling of 12688491 in words is "twelve million, six hundred eighty-eight thousand, four hundred ninety-one".