11728387 has 4 divisors (see below), whose sum is σ = 12794616. Its totient is φ = 10662160.

The previous prime is 11728373. The next prime is 11728391. The reversal of 11728387 is 78382711.

11728387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11728387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11728307) 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, 533098 + ... + 533119.

It is an arithmetic number, because the mean of its divisors is an integer number (3198654).

Almost surely, 2^11728387 is an apocalyptic number.

11728387 is a deficient number, since it is larger than the sum of its proper divisors (1066229).

11728387 is a wasteful number, since it uses less digits than its factorization.

11728387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066228.

The product of its digits is 18816, while the sum is 37.

The square root of 11728387 is about 3424.6732690871. The cubic root of 11728387 is about 227.2023204794.

It can be divided in two parts, 117283 and 87, that added together give a triangular number (117370 = T₄₈₄).

The spelling of 11728387 in words is "eleven million, seven hundred twenty-eight thousand, three hundred eighty-seven".