138708 has 18 divisors (see below), whose sum is σ = 350714. Its totient is φ = 46224.

The previous prime is 138683. The next prime is 138727. The reversal of 138708 is 807831.

138708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 138384 + 324 = 372^2 + 18^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1891 + ... + 1962.

2¹³⁸⁷⁰⁸ is an apocalyptic number.

138708 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138708 is an abundant number, since it is smaller than the sum of its proper divisors (212006).

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

138708 is a wasteful number, since it uses less digits than its factorization.

138708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863 (or 3858 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 138708 is about 372.4352292681. The cubic root of 138708 is about 51.7647161116.

The spelling of 138708 in words is "one hundred thirty-eight thousand, seven hundred eight".