13664747 has 2 divisors, whose sum is σ = 13664748. Its totient is φ = 13664746.

The previous prime is 13664723. The next prime is 13664759. The reversal of 13664747 is 74746631.

It is a strong prime.

It is an emirp because it is prime and its reverse (74746631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13664747 - 2⁸ = 13664491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13664747.

It is not a weakly prime, because it can be changed into another prime (13664647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832373 + 6832374.

It is an arithmetic number, because the mean of its divisors is an integer number (6832374).

Almost surely, 2^13664747 is an apocalyptic number.

13664747 is a deficient number, since it is larger than the sum of its proper divisors (1).

13664747 is an equidigital number, since it uses as much as digits as its factorization.

13664747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 38.

The square root of 13664747 is about 3696.5858572472. The cubic root of 13664747 is about 239.0748351987.

The spelling of 13664747 in words is "thirteen million, six hundred sixty-four thousand, seven hundred forty-seven".