13539729 has 12 divisors (see below), whose sum is σ = 21000624. Its totient is φ = 7736904.

The previous prime is 13539727. The next prime is 13539737. The reversal of 13539729 is 92793531.

13539729 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 13539729 - 2¹ = 13539727 is a prime.

It is a super-2 number, since 2×13539729² = 366648522786882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13539727) 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, 45907 + ... + 46200.

It is an arithmetic number, because the mean of its divisors is an integer number (1750052).

Almost surely, 2^13539729 is an apocalyptic number.

It is an amenable number.

13539729 is a deficient number, since it is larger than the sum of its proper divisors (7460895).

13539729 is an equidigital number, since it uses as much as digits as its factorization.

13539729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92124 (or 92117 counting only the distinct ones).

The product of its digits is 51030, while the sum is 39.

The square root of 13539729 is about 3679.6370744953. The cubic root of 13539729 is about 238.3435062844.

The spelling of 13539729 in words is "thirteen million, five hundred thirty-nine thousand, seven hundred twenty-nine".