138936 has 32 divisors (see below), whose sum is σ = 397440. Its totient is φ = 39648.

The previous prime is 138923. The next prime is 138937. The reversal of 138936 is 639831.

138936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138937) by changing a digit.

138936 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (12420).

2¹³⁸⁹³⁶ is an apocalyptic number.

It is an amenable number.

138936 is an abundant number, since it is smaller than the sum of its proper divisors (258504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138936 is a wasteful number, since it uses less digits than its factorization.

138936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 839 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 138936 is about 372.7411970792. The cubic root of 138936 is about 51.7930631777.

The spelling of 138936 in words is "one hundred thirty-eight thousand, nine hundred thirty-six".