13663405 has 32 divisors (see below), whose sum is σ = 19814400. Its totient is φ = 9031680.

The previous prime is 13663399. The next prime is 13663423. The reversal of 13663405 is 50436631.

It is not a de Polignac number, because 13663405 - 2⁷ = 13663277 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 53037 + ... + 53293.

It is an arithmetic number, because the mean of its divisors is an integer number (619200).

Almost surely, 2^13663405 is an apocalyptic number.

It is an amenable number.

13663405 is a deficient number, since it is larger than the sum of its proper divisors (6150995).

13663405 is an equidigital number, since it uses as much as digits as its factorization.

13663405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 13663405 is about 3696.4043339440. The cubic root of 13663405 is about 239.0670085157.

The spelling of 13663405 in words is "thirteen million, six hundred sixty-three thousand, four hundred five".