13128815 has 24 divisors (see below), whose sum is σ = 18788112. Its totient is φ = 8776320.

The previous prime is 13128809. The next prime is 13128827. The reversal of 13128815 is 51882131.

13128815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13128815 - 2⁶ = 13128751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9392 + ... + 10698.

It is an arithmetic number, because the mean of its divisors is an integer number (782838).

Almost surely, 2^13128815 is an apocalyptic number.

13128815 is a deficient number, since it is larger than the sum of its proper divisors (5659297).

13128815 is a wasteful number, since it uses less digits than its factorization.

13128815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367 (or 1360 counting only the distinct ones).

The product of its digits is 1920, while the sum is 29.

The square root of 13128815 is about 3623.3706683142. The cubic root of 13128815 is about 235.9075514082.

The spelling of 13128815 in words is "thirteen million, one hundred twenty-eight thousand, eight hundred fifteen".