13728731 has 2 divisors, whose sum is σ = 13728732. Its totient is φ = 13728730.

The previous prime is 13728713. The next prime is 13728791. The reversal of 13728731 is 13782731.

Together with previous prime (13728713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13728731 is a prime.

It is a super-2 number, since 2×13728731² = 376956109740722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13728791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6864365 + 6864366.

It is an arithmetic number, because the mean of its divisors is an integer number (6864366).

Almost surely, 2^13728731 is an apocalyptic number.

13728731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13728731 is an equidigital number, since it uses as much as digits as its factorization.

13728731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 13728731 is about 3705.2302222669. The cubic root of 13728731 is about 239.4474033992.

The spelling of 13728731 in words is "thirteen million, seven hundred twenty-eight thousand, seven hundred thirty-one".