13730731 has 6 divisors (see below), whose sum is σ = 15972540. Its totient is φ = 11769156.

The previous prime is 13730729. The next prime is 13730767. The reversal of 13730731 is 13703731.

13730731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13730731 - 2¹ = 13730729 is a prime.

It is a super-2 number, since 2×13730731² = 377065947588722, which contains 22 as substring.

It is the 3706-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13730696 and 13730705.

It is not an unprimeable number, because it can be changed into a prime (13730231) by changing a digit.

It is a nontrivial repunit in base 3705.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140061 + ... + 140158.

It is an arithmetic number, because the mean of its divisors is an integer number (2662090).

Almost surely, 2^13730731 is an apocalyptic number.

13730731 is a deficient number, since it is larger than the sum of its proper divisors (2241809).

13730731 is an equidigital number, since it uses as much as digits as its factorization.

13730731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280233 (or 280226 counting only the distinct ones).

The product of its (nonzero) digits is 1323, while the sum is 25.

The square root of 13730731 is about 3705.5001012009. The cubic root of 13730731 is about 239.4590303916.

Subtracting from 13730731 its reverse (13703731), we obtain a cube (27000 = 30³).

The spelling of 13730731 in words is "thirteen million, seven hundred thirty thousand, seven hundred thirty-one".