138598 has 12 divisors (see below), whose sum is σ = 218988. Its totient is φ = 65780.

The previous prime is 138587. The next prime is 138599. The reversal of 138598 is 895831.

138598 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 993 + ... + 1123.

It is an arithmetic number, because the mean of its divisors is an integer number (18249).

2¹³⁸⁵⁹⁸ is an apocalyptic number.

138598 is a deficient number, since it is larger than the sum of its proper divisors (80390).

138598 is a wasteful number, since it uses less digits than its factorization.

138598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 156 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 138598 is about 372.2875232935. The cubic root of 138598 is about 51.7510287861.

The spelling of 138598 in words is "one hundred thirty-eight thousand, five hundred ninety-eight".