138635 has 16 divisors (see below), whose sum is σ = 202176. Its totient is φ = 89088.

The previous prime is 138629. The next prime is 138637. The reversal of 138635 is 536831.

138635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138635 - 2⁶ = 138571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138637) 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, 479 + ... + 711.

It is an arithmetic number, because the mean of its divisors is an integer number (12636).

2¹³⁸⁶³⁵ is an apocalyptic number.

138635 is a deficient number, since it is larger than the sum of its proper divisors (63541).

138635 is a wasteful number, since it uses less digits than its factorization.

138635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its digits is 2160, while the sum is 26.

The square root of 138635 is about 372.3372127521. The cubic root of 138635 is about 51.7556335128.

The spelling of 138635 in words is "one hundred thirty-eight thousand, six hundred thirty-five".