138657017 has 4 divisors (see below), whose sum is σ = 143129856. Its totient is φ = 134184180.

The previous prime is 138657007. The next prime is 138657073. The reversal of 138657017 is 710756831.

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: 710756831 = 15809 ⋅44959.

It is a cyclic number.

It is not a de Polignac number, because 138657017 - 2⁶ = 138656953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138657007) 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, 2236373 + ... + 2236434.

It is an arithmetic number, because the mean of its divisors is an integer number (35782464).

Almost surely, 2^138657017 is an apocalyptic number.

It is an amenable number.

138657017 is a deficient number, since it is larger than the sum of its proper divisors (4472839).

138657017 is an equidigital number, since it uses as much as digits as its factorization.

138657017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472838.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 138657017 is about 11775.2714193771. The cubic root of 138657017 is about 517.5837318519.

The spelling of 138657017 in words is "one hundred thirty-eight million, six hundred fifty-seven thousand, seventeen".