13243728 has 20 divisors (see below), whose sum is σ = 34213088. Its totient is φ = 4414560.

The previous prime is 13243723. The next prime is 13243739. The reversal of 13243728 is 82734231.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 13243695 and 13243704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13243723) 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, 137908 + ... + 138003.

Almost surely, 2^13243728 is an apocalyptic number.

It is an amenable number.

13243728 is an abundant number, since it is smaller than the sum of its proper divisors (20969360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13243728 is a wasteful number, since it uses less digits than its factorization.

13243728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275922 (or 275916 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 13243728 is about 3639.1933172064. The cubic root of 13243728 is about 236.5938315401.

Adding to 13243728 its reverse (82734231), we get a palindrome (95977959).

The spelling of 13243728 in words is "thirteen million, two hundred forty-three thousand, seven hundred twenty-eight".