13428729 has 12 divisors (see below), whose sum is σ = 19429696. Its totient is φ = 8937432.

The previous prime is 13428721. The next prime is 13428731. The reversal of 13428729 is 92782431.

It is not a de Polignac number, because 13428729 - 2³ = 13428721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13428693 and 13428702.

It is not an unprimeable number, because it can be changed into a prime (13428721) 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, 7932 + ... + 9474.

Almost surely, 2^13428729 is an apocalyptic number.

It is an amenable number.

13428729 is a deficient number, since it is larger than the sum of its proper divisors (6000967).

13428729 is a wasteful number, since it uses less digits than its factorization.

13428729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516 (or 2513 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 13428729 is about 3664.5230248970. The cubic root of 13428729 is about 237.6903972767.

The spelling of 13428729 in words is "thirteen million, four hundred twenty-eight thousand, seven hundred twenty-nine".