138627617 has 4 divisors (see below), whose sum is σ = 139899540. Its totient is φ = 137355696.

The previous prime is 138627613. The next prime is 138627637. The reversal of 138627617 is 716726831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716726831 = 2017 ⋅355343.

It can be written as a sum of positive squares in 2 ways, for example, as 51036736 + 87590881 = 7144^2 + 9359^2 .

It is not a de Polignac number, because 138627617 - 2² = 138627613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138627613) 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, 635798 + ... + 636015.

It is an arithmetic number, because the mean of its divisors is an integer number (34974885).

Almost surely, 2^138627617 is an apocalyptic number.

It is an amenable number.

138627617 is a deficient number, since it is larger than the sum of its proper divisors (1271923).

138627617 is a wasteful number, since it uses less digits than its factorization.

138627617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271922.

The product of its digits is 84672, while the sum is 41.

The square root of 138627617 is about 11774.0229743278. The cubic root of 138627617 is about 517.5471474855.

The spelling of 138627617 in words is "one hundred thirty-eight million, six hundred twenty-seven thousand, six hundred seventeen".