138404225 has 24 divisors (see below), whose sum is σ = 189630720. Its totient is φ = 99672320.

The previous prime is 138404221. The next prime is 138404249. The reversal of 138404225 is 522404831.

It is a happy number.

It is not a de Polignac number, because 138404225 - 2² = 138404221 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (138404221) 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 23 ways as a sum of consecutive naturals, for example, 2696 + ... + 16854.

It is an arithmetic number, because the mean of its divisors is an integer number (7901280).

Almost surely, 2^138404225 is an apocalyptic number.

It is an amenable number.

138404225 is a deficient number, since it is larger than the sum of its proper divisors (51226495).

138404225 is a wasteful number, since it uses less digits than its factorization.

138404225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14209 (or 14204 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 138404225 is about 11764.5325023989. The cubic root of 138404225 is about 517.2689969174.

The spelling of 138404225 in words is "one hundred thirty-eight million, four hundred four thousand, two hundred twenty-five".