138618625 has 16 divisors (see below), whose sum is σ = 175443840. Its totient is φ = 109326000.

The previous prime is 138618619. The next prime is 138618647. The reversal of 138618625 is 526816831.

It is not a de Polignac number, because 138618625 - 2³ = 138618617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1066 + ... + 16684.

It is an arithmetic number, because the mean of its divisors is an integer number (10965240).

Almost surely, 2^138618625 is an apocalyptic number.

It is an amenable number.

138618625 is a deficient number, since it is larger than the sum of its proper divisors (36825215).

138618625 is an equidigital number, since it uses as much as digits as its factorization.

138618625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15705 (or 15695 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 138618625 is about 11773.6411105486. The cubic root of 138618625 is about 517.5359571117.

The spelling of 138618625 in words is "one hundred thirty-eight million, six hundred eighteen thousand, six hundred twenty-five".