138599 has 2 divisors, whose sum is σ = 138600. Its totient is φ = 138598.

The previous prime is 138587. The next prime is 138617. The reversal of 138599 is 995831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138599 - 2¹² = 134503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69299 + 69300.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2¹³⁸⁵⁹⁹ is an apocalyptic number.

138599 is a deficient number, since it is larger than the sum of its proper divisors (1).

138599 is an equidigital number, since it uses as much as digits as its factorization.

138599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 138599 is about 372.2888663390. The cubic root of 138599 is about 51.7511532490.

It can be divided in two parts, 138 and 599, that added together give a palindrome (737).

The spelling of 138599 in words is "one hundred thirty-eight thousand, five hundred ninety-nine".