13128399 has 10 divisors (see below), whose sum is σ = 19611680. Its totient is φ = 8752212.

The previous prime is 13128347. The next prime is 13128413. The reversal of 13128399 is 99382131.

13128399 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 13128399 - 2⁹ = 13127887 is a prime.

It is a Duffinian number.

It is a congruent 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 9 ways as a sum of consecutive naturals, for example, 80959 + ... + 81120.

It is an arithmetic number, because the mean of its divisors is an integer number (1961168).

Almost surely, 2^13128399 is an apocalyptic number.

13128399 is a deficient number, since it is larger than the sum of its proper divisors (6483281).

13128399 is an equidigital number, since it uses as much as digits as its factorization.

13128399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162091 (or 162082 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 13128399 is about 3623.3132627472. The cubic root of 13128399 is about 235.9050597241.

The spelling of 13128399 in words is "thirteen million, one hundred twenty-eight thousand, three hundred ninety-nine".