11728729 has 4 divisors (see below), whose sum is σ = 11744676. Its totient is φ = 11712784.

The previous prime is 11728721. The next prime is 11728751. The reversal of 11728729 is 92782711.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5736025 + 5992704 = 2395^2 + 2448^2 .

It is a cyclic number.

It is not a de Polignac number, because 11728729 - 2³ = 11728721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11728721) 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, 6814 + ... + 8359.

It is an arithmetic number, because the mean of its divisors is an integer number (2936169).

Almost surely, 2^11728729 is an apocalyptic number.

It is an amenable number.

11728729 is a deficient number, since it is larger than the sum of its proper divisors (15947).

11728729 is an equidigital number, since it uses as much as digits as its factorization.

11728729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15946.

The product of its digits is 14112, while the sum is 37.

The square root of 11728729 is about 3424.7232004937. The cubic root of 11728729 is about 227.2045288660.

The spelling of 11728729 in words is "eleven million, seven hundred twenty-eight thousand, seven hundred twenty-nine".