11728809 has 12 divisors (see below), whose sum is σ = 17336176. Its totient is φ = 7637112.

The previous prime is 11728807. The next prime is 11728811. The reversal of 11728809 is 90882711.

11728809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11728807) and next prime (11728811).

It is not a de Polignac number, because 11728809 - 2¹ = 11728807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11728807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14767 + ... + 15540.

Almost surely, 2^11728809 is an apocalyptic number.

It is an amenable number.

11728809 is a deficient number, since it is larger than the sum of its proper divisors (5607367).

11728809 is a wasteful number, since it uses less digits than its factorization.

11728809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30356 (or 30353 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 11728809 is about 3424.7348802499. The cubic root of 11728809 is about 227.2050454415.

It can be divided in two parts, 1172880 and 9, that added together give a square (1172889 = 1083²).

The spelling of 11728809 in words is "eleven million, seven hundred twenty-eight thousand, eight hundred nine".