13128369 has 16 divisors (see below), whose sum is σ = 18931968. Its totient is φ = 8060672.

The previous prime is 13128347. The next prime is 13128413. The reversal of 13128369 is 96382131.

It is a cyclic number.

It is not a de Polignac number, because 13128369 - 2⁵ = 13128337 is a prime.

It is a super-2 number, since 2×13128369² = 344708145200322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13128319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342 + ... + 5135.

It is an arithmetic number, because the mean of its divisors is an integer number (1183248).

Almost surely, 2^13128369 is an apocalyptic number.

It is an amenable number.

13128369 is a deficient number, since it is larger than the sum of its proper divisors (5803599).

13128369 is a wasteful number, since it uses less digits than its factorization.

13128369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544.

The product of its digits is 7776, while the sum is 33.

The square root of 13128369 is about 3623.3091228875. The cubic root of 13128369 is about 235.9048800334.

The spelling of 13128369 in words is "thirteen million, one hundred twenty-eight thousand, three hundred sixty-nine".