13663686 has 16 divisors (see below), whose sum is σ = 27584064. Its totient is φ = 4511784.

The previous prime is 13663681. The next prime is 13663691. The reversal of 13663686 is 68636631.

It is an interprime number because it is at equal distance from previous prime (13663681) and next prime (13663691).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10000 + ... + 11283.

It is an arithmetic number, because the mean of its divisors is an integer number (1724004).

Almost surely, 2^13663686 is an apocalyptic number.

13663686 is an abundant number, since it is smaller than the sum of its proper divisors (13920378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13663686 is a wasteful number, since it uses less digits than its factorization.

13663686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21395.

The product of its digits is 93312, while the sum is 39.

The square root of 13663686 is about 3696.4423436596. The cubic root of 13663686 is about 239.0686473792.

The spelling of 13663686 in words is "thirteen million, six hundred sixty-three thousand, six hundred eighty-six".