138625673 has 4 divisors (see below), whose sum is σ = 139623120. Its totient is φ = 137628228.

The previous prime is 138625649. The next prime is 138625703. The reversal of 138625673 is 376526831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 376526831 = 61 ⋅6172571.

It is a cyclic number.

It is not a de Polignac number, because 138625673 - 2²² = 134431369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138625673.

It is not an unprimeable number, because it can be changed into a prime (138625373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498515 + ... + 498792.

It is an arithmetic number, because the mean of its divisors is an integer number (34905780).

Almost surely, 2^138625673 is an apocalyptic number.

It is an amenable number.

138625673 is a deficient number, since it is larger than the sum of its proper divisors (997447).

138625673 is an equidigital number, since it uses as much as digits as its factorization.

138625673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997446.

The product of its digits is 181440, while the sum is 41.

The square root of 138625673 is about 11773.9404194178. The cubic root of 138625673 is about 517.5447282553.

The spelling of 138625673 in words is "one hundred thirty-eight million, six hundred twenty-five thousand, six hundred seventy-three".