138128325 has 12 divisors (see below), whose sum is σ = 228372288. Its totient is φ = 73668400.

The previous prime is 138128321. The next prime is 138128359. The reversal of 138128325 is 523821831.

It is not a de Polignac number, because 138128325 - 2² = 138128321 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138128321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 920781 + ... + 920930.

It is an arithmetic number, because the mean of its divisors is an integer number (19031024).

Almost surely, 2^138128325 is an apocalyptic number.

138128325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138128325 is a deficient number, since it is larger than the sum of its proper divisors (90243963).

138128325 is a wasteful number, since it uses less digits than its factorization.

138128325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841724 (or 1841719 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 138128325 is about 11752.8007300388. The cubic root of 138128325 is about 516.9250540160.

The spelling of 138128325 in words is "one hundred thirty-eight million, one hundred twenty-eight thousand, three hundred twenty-five".