138606225 has 24 divisors (see below), whose sum is σ = 237068160. Its totient is φ = 71373120.

The previous prime is 138606191. The next prime is 138606227. The reversal of 138606225 is 522606831.

It is not a de Polignac number, because 138606225 - 2⁶ = 138606161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138606227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29689 + ... + 34038.

It is an arithmetic number, because the mean of its divisors is an integer number (9877840).

Almost surely, 2^138606225 is an apocalyptic number.

138606225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138606225 is a deficient number, since it is larger than the sum of its proper divisors (98461935).

138606225 is a wasteful number, since it uses less digits than its factorization.

138606225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63769 (or 63764 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 138606225 is about 11773.1144987212. The cubic root of 138606225 is about 517.5205247525.

It can be divided in two parts, 138606 and 225, that added together give a palindrome (138831).

The spelling of 138606225 in words is "one hundred thirty-eight million, six hundred six thousand, two hundred twenty-five".