138519717 has 12 divisors (see below), whose sum is σ = 214847136. Its totient is φ = 79154040.

The previous prime is 138519701. The next prime is 138519751. The reversal of 138519717 is 717915831.

It is a happy number.

It is not a de Polignac number, because 138519717 - 2⁴ = 138519701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138519517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471009 + ... + 471302.

It is an arithmetic number, because the mean of its divisors is an integer number (17903928).

Almost surely, 2^138519717 is an apocalyptic number.

It is an amenable number.

138519717 is a deficient number, since it is larger than the sum of its proper divisors (76327419).

138519717 is an equidigital number, since it uses as much as digits as its factorization.

138519717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942328 (or 942321 counting only the distinct ones).

The product of its digits is 52920, while the sum is 42.

The square root of 138519717 is about 11769.4399611876. The cubic root of 138519717 is about 517.4128360279.

The spelling of 138519717 in words is "one hundred thirty-eight million, five hundred nineteen thousand, seven hundred seventeen".