138537717 has 16 divisors (see below), whose sum is σ = 196853760. Its totient is φ = 86461232.

The previous prime is 138537713. The next prime is 138537719. The reversal of 138537717 is 717735831.

138537717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138537717 - 2² = 138537713 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138537713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18117 + ... + 24602.

It is an arithmetic number, because the mean of its divisors is an integer number (12303360).

Almost surely, 2^138537717 is an apocalyptic number.

It is an amenable number.

138537717 is a deficient number, since it is larger than the sum of its proper divisors (58316043).

138537717 is a wasteful number, since it uses less digits than its factorization.

138537717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42792.

The product of its digits is 123480, while the sum is 42.

The square root of 138537717 is about 11770.2046286375. The cubic root of 138537717 is about 517.4352468631.

The spelling of 138537717 in words is "one hundred thirty-eight million, five hundred thirty-seven thousand, seven hundred seventeen".