13728831 has 4 divisors (see below), whose sum is σ = 18305112. Its totient is φ = 9152552.

The previous prime is 13728823. The next prime is 13728881. The reversal of 13728831 is 13882731.

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

It is a cyclic number.

It is not a de Polignac number, because 13728831 - 2³ = 13728823 is a prime.

It is a super-2 number, since 2×13728831² = 376961601253122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13728792 and 13728801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13728821) 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, 2288136 + ... + 2288141.

It is an arithmetic number, because the mean of its divisors is an integer number (4576278).

Almost surely, 2^13728831 is an apocalyptic number.

13728831 is a deficient number, since it is larger than the sum of its proper divisors (4576281).

13728831 is an equidigital number, since it uses as much as digits as its factorization.

13728831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576280.

The product of its digits is 8064, while the sum is 33.

The square root of 13728831 is about 3705.2437166805. The cubic root of 13728831 is about 239.4479847756.

The spelling of 13728831 in words is "thirteen million, seven hundred twenty-eight thousand, eight hundred thirty-one".