13664539 has 16 divisors (see below), whose sum is σ = 16369920. Its totient is φ = 11158560.

The previous prime is 13664533. The next prime is 13664543. The reversal of 13664539 is 93546631.

It is not a de Polignac number, because 13664539 - 2³ = 13664531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13664498 and 13664507.

It is not an unprimeable number, because it can be changed into a prime (13664531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16444 + ... + 17254.

It is an arithmetic number, because the mean of its divisors is an integer number (1023120).

Almost surely, 2^13664539 is an apocalyptic number.

13664539 is a deficient number, since it is larger than the sum of its proper divisors (2705381).

13664539 is an equidigital number, since it uses as much as digits as its factorization.

13664539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930.

The product of its digits is 58320, while the sum is 37.

The square root of 13664539 is about 3696.5577230716. The cubic root of 13664539 is about 239.0736221547.

The spelling of 13664539 in words is "thirteen million, six hundred sixty-four thousand, five hundred thirty-nine".