138116817 has 48 divisors (see below), whose sum is σ = 217451520. Its totient is φ = 84246624.

The previous prime is 138116809. The next prime is 138116861. The reversal of 138116817 is 718611831.

It is a happy number.

It is not a de Polignac number, because 138116817 - 2³ = 138116809 is a prime.

It is a super-2 number, since 2×138116817² = 38152510276422978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138116617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 525028 + ... + 525290.

It is an arithmetic number, because the mean of its divisors is an integer number (4530240).

Almost surely, 2^138116817 is an apocalyptic number.

It is an amenable number.

138116817 is a deficient number, since it is larger than the sum of its proper divisors (79334703).

138116817 is a wasteful number, since it uses less digits than its factorization.

138116817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 391 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 138116817 is about 11752.3111344110. The cubic root of 138116817 is about 516.9106979483.

The spelling of 138116817 in words is "one hundred thirty-eight million, one hundred sixteen thousand, eight hundred seventeen".