138212517 has 16 divisors (see below), whose sum is σ = 198717120. Its totient is φ = 85161600.

The previous prime is 138212509. The next prime is 138212537. The reversal of 138212517 is 715212831.

138212517 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 138212517 - 2³ = 138212509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138212537) 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, 27234 + ... + 31907.

It is an arithmetic number, because the mean of its divisors is an integer number (12419820).

Almost surely, 2^138212517 is an apocalyptic number.

It is an amenable number.

138212517 is a deficient number, since it is larger than the sum of its proper divisors (60504603).

138212517 is a wasteful number, since it uses less digits than its factorization.

138212517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59204.

The product of its digits is 3360, while the sum is 30.

The square root of 138212517 is about 11756.3819689563. The cubic root of 138212517 is about 517.0300581002.

The spelling of 138212517 in words is "one hundred thirty-eight million, two hundred twelve thousand, five hundred seventeen".