138648317 has 4 divisors (see below), whose sum is σ = 138852000. Its totient is φ = 138444636.

The previous prime is 138648283. The next prime is 138648319. The reversal of 138648317 is 713846831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138648317 - 2⁶ = 138648253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138648319) 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, 100817 + ... + 102182.

It is an arithmetic number, because the mean of its divisors is an integer number (34713000).

Almost surely, 2^138648317 is an apocalyptic number.

It is an amenable number.

138648317 is a deficient number, since it is larger than the sum of its proper divisors (203683).

138648317 is an equidigital number, since it uses as much as digits as its factorization.

138648317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203682.

The product of its digits is 96768, while the sum is 41.

The square root of 138648317 is about 11774.9019953459. The cubic root of 138648317 is about 517.5729064047.

The spelling of 138648317 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, three hundred seventeen".