13128686 has 16 divisors (see below), whose sum is σ = 20528640. Its totient is φ = 6290040.

The previous prime is 13128667. The next prime is 13128701. The reversal of 13128686 is 68682131.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5645 + ... + 7623.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^13128686 is an apocalyptic number.

13128686 is a deficient number, since it is larger than the sum of its proper divisors (7399954).

13128686 is a wasteful number, since it uses less digits than its factorization.

13128686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119.

The product of its digits is 13824, while the sum is 35.

The square root of 13128686 is about 3623.3528671660. The cubic root of 13128686 is about 235.9067787522.

The spelling of 13128686 in words is "thirteen million, one hundred twenty-eight thousand, six hundred eighty-six".