138542 has 8 divisors (see below), whose sum is σ = 211896. Its totient is φ = 67912.

The previous prime is 138517. The next prime is 138547. The reversal of 138542 is 245831.

138542 is nontrivially palindromic in base 15.

138542 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (138547) 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, 548 + ... + 759.

It is an arithmetic number, because the mean of its divisors is an integer number (26487).

2¹³⁸⁵⁴² is an apocalyptic number.

138542 is a deficient number, since it is larger than the sum of its proper divisors (73354).

138542 is a wasteful number, since it uses less digits than its factorization.

138542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362.

The product of its digits is 960, while the sum is 23.

The square root of 138542 is about 372.2123050088. The cubic root of 138542 is about 51.7440579111.

The spelling of 138542 in words is "one hundred thirty-eight thousand, five hundred forty-two".