138657625 has 16 divisors (see below), whose sum is σ = 173377152. Its totient is φ = 110713200.

The previous prime is 138657619. The next prime is 138657641. The reversal of 138657625 is 526756831.

It is a de Polignac number, because none of the positive numbers 2^k-138657625 is a prime.

It is a Duffinian number.

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, 112764 + ... + 113986.

It is an arithmetic number, because the mean of its divisors is an integer number (10836072).

Almost surely, 2^138657625 is an apocalyptic number.

It is an amenable number.

138657625 is a deficient number, since it is larger than the sum of its proper divisors (34719527).

138657625 is an equidigital number, since it uses as much as digits as its factorization.

138657625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145 (or 2135 counting only the distinct ones).

The product of its digits is 302400, while the sum is 43.

The square root of 138657625 is about 11775.2972361635. The cubic root of 138657625 is about 517.5844883720.

The spelling of 138657625 in words is "one hundred thirty-eight million, six hundred fifty-seven thousand, six hundred twenty-five".