13664247 has 4 divisors (see below), whose sum is σ = 18219000. Its totient is φ = 9109496.

The previous prime is 13664237. The next prime is 13664251. The reversal of 13664247 is 74246631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13664247 - 2¹¹ = 13662199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277372 + ... + 2277377.

It is an arithmetic number, because the mean of its divisors is an integer number (4554750).

Almost surely, 2^13664247 is an apocalyptic number.

13664247 is a deficient number, since it is larger than the sum of its proper divisors (4554753).

13664247 is an equidigital number, since it uses as much as digits as its factorization.

13664247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554752.

The product of its digits is 24192, while the sum is 33.

The square root of 13664247 is about 3696.5182266560. The cubic root of 13664247 is about 239.0719192068.

The spelling of 13664247 in words is "thirteen million, six hundred sixty-four thousand, two hundred forty-seven".