138886225 has 9 divisors (see below), whose sum is σ = 172292017. Its totient is φ = 111061840.

The previous prime is 138886207. The next prime is 138886261. The reversal of 138886225 is 522688831.

The square root of 138886225 is 11785.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 30393169 + 108493056 = 5513^2 + 10416^2 .

It is not a de Polignac number, because 138886225 - 2¹⁵ = 138853457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 57747 + ... + 60103.

Almost surely, 2^138886225 is an apocalyptic number.

138886225 is the 11785-th square number.

138886225 is the 5893-rd centered octagonal number.

It is an amenable number.

138886225 is a deficient number, since it is larger than the sum of its proper divisors (33405792).

138886225 is an frugal number, since it uses more digits than its factorization.

138886225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724 (or 2362 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The cubic root of 138886225 is about 517.8687733756.

The spelling of 138886225 in words is "one hundred thirty-eight million, eight hundred eighty-six thousand, two hundred twenty-five".