11728389 has 4 divisors (see below), whose sum is σ = 15637856. Its totient is φ = 7818924.

The previous prime is 11728373. The next prime is 11728391. The reversal of 11728389 is 98382711.

11728389 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11728389 - 2⁴ = 11728373 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 (11728309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954729 + ... + 1954734.

It is an arithmetic number, because the mean of its divisors is an integer number (3909464).

Almost surely, 2^11728389 is an apocalyptic number.

It is an amenable number.

11728389 is a deficient number, since it is larger than the sum of its proper divisors (3909467).

11728389 is an equidigital number, since it uses as much as digits as its factorization.

11728389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909466.

The product of its digits is 24192, while the sum is 39.

The square root of 11728389 is about 3424.6735610858. The cubic root of 11728389 is about 227.2023333941.

The spelling of 11728389 in words is "eleven million, seven hundred twenty-eight thousand, three hundred eighty-nine".