13509747 has 20 divisors (see below), whose sum is σ = 21370536. Its totient is φ = 8475840.

The previous prime is 13509689. The next prime is 13509757. The reversal of 13509747 is 74790531.

It is a happy number.

13509747 is nontrivially palindromic in base 2.

13509747 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 13509747 - 2⁷ = 13509619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13509757) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3529 + ... + 6282.

Almost surely, 2^13509747 is an apocalyptic number.

13509747 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13509747 is a deficient number, since it is larger than the sum of its proper divisors (7860789).

13509747 is an equidigital number, since it uses as much as digits as its factorization.

13509747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9840 (or 9831 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 13509747 is about 3675.5607735419. The cubic root of 13509747 is about 238.1674491873.

The spelling of 13509747 in words is "thirteen million, five hundred nine thousand, seven hundred forty-seven".