138842 has 8 divisors (see below), whose sum is σ = 227232. Its totient is φ = 63100.

The previous prime is 138841. The next prime is 138863. The reversal of 138842 is 248831.

138842 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 not an unprimeable number, because it can be changed into a prime (138841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3134 + ... + 3177.

It is an arithmetic number, because the mean of its divisors is an integer number (28404).

2¹³⁸⁸⁴² is an apocalyptic number.

138842 is a deficient number, since it is larger than the sum of its proper divisors (88390).

138842 is a wasteful number, since it uses less digits than its factorization.

138842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324.

The product of its digits is 1536, while the sum is 26.

The square root of 138842 is about 372.6150828939. The cubic root of 138842 is about 51.7813799894.

The spelling of 138842 in words is "one hundred thirty-eight thousand, eight hundred forty-two".