138929 has 8 divisors (see below), whose sum is σ = 161280. Its totient is φ = 117216.

The previous prime is 138923. The next prime is 138937. The reversal of 138929 is 929831.

138929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138895 and 138904.

It is not an unprimeable number, because it can be changed into a prime (138923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512 + ... + 734.

It is an arithmetic number, because the mean of its divisors is an integer number (20160).

2¹³⁸⁹²⁹ is an apocalyptic number.

It is an amenable number.

138929 is a deficient number, since it is larger than the sum of its proper divisors (22351).

138929 is an equidigital number, since it uses as much as digits as its factorization.

138929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319.

The product of its digits is 3888, while the sum is 32.

The square root of 138929 is about 372.7318070678. The cubic root of 138929 is about 51.7921933346.

The spelling of 138929 in words is "one hundred thirty-eight thousand, nine hundred twenty-nine".