11428729 has 4 divisors (see below), whose sum is σ = 12307876. Its totient is φ = 10549584.

The previous prime is 11428721. The next prime is 11428733. The reversal of 11428729 is 92782411.

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 898704 + 10530025 = 948^2 + 3245^2 .

It is a cyclic number.

It is not a de Polignac number, because 11428729 - 2³ = 11428721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11428694 and 11428703.

It is not an unprimeable number, because it can be changed into a prime (11428721) 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, 439554 + ... + 439579.

It is an arithmetic number, because the mean of its divisors is an integer number (3076969).

Almost surely, 2^11428729 is an apocalyptic number.

It is an amenable number.

11428729 is a deficient number, since it is larger than the sum of its proper divisors (879147).

11428729 is an equidigital number, since it uses as much as digits as its factorization.

11428729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879146.

The product of its digits is 8064, while the sum is 34.

The square root of 11428729 is about 3380.6403239623. The cubic root of 11428729 is about 225.2506112935.

The spelling of 11428729 in words is "eleven million, four hundred twenty-eight thousand, seven hundred twenty-nine".