138699617 has 16 divisors (see below), whose sum is σ = 168710400. Its totient is φ = 111310848.

The previous prime is 138699607. The next prime is 138699641. The reversal of 138699617 is 716996831.

It is a cyclic number.

It is not a de Polignac number, because 138699617 - 2²⁴ = 121922401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138699607) 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, 20753 + ... + 26609.

It is an arithmetic number, because the mean of its divisors is an integer number (10544400).

Almost surely, 2^138699617 is an apocalyptic number.

138699617 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138699617 is a deficient number, since it is larger than the sum of its proper divisors (30010783).

138699617 is a wasteful number, since it uses less digits than its factorization.

138699617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080.

The product of its digits is 489888, while the sum is 50.

The square root of 138699617 is about 11777.0801559640. The cubic root of 138699617 is about 517.6367326779.

The spelling of 138699617 in words is "one hundred thirty-eight million, six hundred ninety-nine thousand, six hundred seventeen".