138888825 has 12 divisors (see below), whose sum is σ = 229629648. Its totient is φ = 74074000.

The previous prime is 138888791. The next prime is 138888829. The reversal of 138888825 is 528888831.

It is not a de Polignac number, because 138888825 - 2¹¹ = 138886777 is a prime.

It is a super-3 number, since 3×138888825³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138888829) 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 11 ways as a sum of consecutive naturals, for example, 925851 + ... + 926000.

It is an arithmetic number, because the mean of its divisors is an integer number (19135804).

Almost surely, 2^138888825 is an apocalyptic number.

138888825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138888825 is a deficient number, since it is larger than the sum of its proper divisors (90740823).

138888825 is a wasteful number, since it uses less digits than its factorization.

138888825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851864 (or 1851859 counting only the distinct ones).

The product of its digits is 983040, while the sum is 51.

The square root of 138888825 is about 11785.1103091995. The cubic root of 138888825 is about 517.8720049186.

The spelling of 138888825 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, eight hundred twenty-five".