13128538 has 16 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 6237616.

The previous prime is 13128529. The next prime is 13128541. The reversal of 13128538 is 83582131.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6828 + ... + 8536.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^13128538 is an apocalyptic number.

13128538 is a deficient number, since it is larger than the sum of its proper divisors (7555622).

13128538 is a wasteful number, since it uses less digits than its factorization.

13128538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901.

The product of its digits is 5760, while the sum is 31.

The square root of 13128538 is about 3623.3324440355. The cubic root of 13128538 is about 235.9058922879.

The spelling of 13128538 in words is "thirteen million, one hundred twenty-eight thousand, five hundred thirty-eight".