138015625 has 42 divisors (see below), whose sum is σ = 192224102. Its totient is φ = 99000000.

The previous prime is 138015583. The next prime is 138015643. The reversal of 138015625 is 526510831.

138015625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 7 ways, for example, as 138015504 + 121 = 11748^2 + 11^2 .

It is not a de Polignac number, because 138015625 - 2⁷ = 138015497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 1890589 + ... + 1890661.

Almost surely, 2^138015625 is an apocalyptic number.

It is an amenable number.

138015625 is a deficient number, since it is larger than the sum of its proper divisors (54208477).

138015625 is an frugal number, since it uses more digits than its factorization.

138015625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 138015625 is about 11748.0051498116. The cubic root of 138015625 is about 516.7844280075.

The spelling of 138015625 in words is "one hundred thirty-eight million, fifteen thousand, six hundred twenty-five".