13638208 has 14 divisors (see below), whose sum is σ = 27063446. Its totient is φ = 6819072.

The previous prime is 13638203. The next prime is 13638211. The reversal of 13638208 is 80283631.

It can be written as a sum of positive squares in only one way, i.e., 13601344 + 36864 = 3688^2 + 192^2 .

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 13638208.

It is not an unprimeable number, because it can be changed into a prime (13638203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106485 + ... + 106612.

Almost surely, 2^13638208 is an apocalyptic number.

It is an amenable number.

13638208 is a deficient number, since it is larger than the sum of its proper divisors (13425238).

13638208 is an equidigital number, since it uses as much as digits as its factorization.

13638208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213109 (or 213099 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 13638208 is about 3692.9944489533. The cubic root of 13638208 is about 238.9199617614.

The spelling of 13638208 in words is "thirteen million, six hundred thirty-eight thousand, two hundred eight".