13638225 has 48 divisors (see below), whose sum is σ = 23784192. Its totient is φ = 6888960.

The previous prime is 13638223. The next prime is 13638239. The reversal of 13638225 is 52283631.

It is not a de Polignac number, because 13638225 - 2¹ = 13638223 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13638192 and 13638201.

It is not an unprimeable number, because it can be changed into a prime (13638223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186789 + ... + 186861.

It is an arithmetic number, because the mean of its divisors is an integer number (495504).

Almost surely, 2^13638225 is an apocalyptic number.

13638225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13638225 is a deficient number, since it is larger than the sum of its proper divisors (10145967).

13638225 is a wasteful number, since it uses less digits than its factorization.

13638225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 181 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 13638225 is about 3692.9967506078. The cubic root of 13638225 is about 238.9200610325.

The spelling of 13638225 in words is "thirteen million, six hundred thirty-eight thousand, two hundred twenty-five".