129138 has 8 divisors (see below), whose sum is σ = 258288. Its totient is φ = 43044.

The previous prime is 129127. The next prime is 129169. The reversal of 129138 is 831921.

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

129138 is an admirable number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10756 + ... + 10767.

It is an arithmetic number, because the mean of its divisors is an integer number (32286).

2¹²⁹¹³⁸ is an apocalyptic number.

129138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129138 is a wasteful number, since it uses less digits than its factorization.

129138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21528.

The product of its digits is 432, while the sum is 24.

The square root of 129138 is about 359.3577604561. The cubic root of 129138 is about 50.5457546960.

It can be divided in two parts, 12913 and 8, that added together give a palindrome (12921).

The spelling of 129138 in words is "one hundred twenty-nine thousand, one hundred thirty-eight".