138543 has 4 divisors (see below), whose sum is σ = 184728. Its totient is φ = 92360.

The previous prime is 138517. The next prime is 138547. The reversal of 138543 is 345831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138543 - 2⁵ = 138511 is a prime.

It is a D-number.

138543 is a lucky number.

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, 23088 + ... + 23093.

It is an arithmetic number, because the mean of its divisors is an integer number (46182).

2¹³⁸⁵⁴³ is an apocalyptic number.

138543 is a deficient number, since it is larger than the sum of its proper divisors (46185).

138543 is an equidigital number, since it uses as much as digits as its factorization.

138543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46184.

The product of its digits is 1440, while the sum is 24.

The square root of 138543 is about 372.2136483258. The cubic root of 138543 is about 51.7441824075.

The spelling of 138543 in words is "one hundred thirty-eight thousand, five hundred forty-three".