138984 has 16 divisors (see below), whose sum is σ = 347520. Its totient is φ = 46320.

The previous prime is 138977. The next prime is 139021. The reversal of 138984 is 489831.

138984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

138984 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 3 ways as a sum of consecutive naturals, for example, 2872 + ... + 2919.

It is an arithmetic number, because the mean of its divisors is an integer number (21720).

2¹³⁸⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

138984 is an abundant number, since it is smaller than the sum of its proper divisors (208536).

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

138984 is a wasteful number, since it uses less digits than its factorization.

138984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5800 (or 5796 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 138984 is about 372.8055793574. The cubic root of 138984 is about 51.7990270286.

The spelling of 138984 in words is "one hundred thirty-eight thousand, nine hundred eighty-four".