139543 has 4 divisors (see below), whose sum is σ = 142560. Its totient is φ = 136528.

The previous prime is 139537. The next prime is 139547. The reversal of 139543 is 345931.

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 139543 - 2⁵ = 139511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438 + ... + 1531.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2¹³⁹⁵⁴³ is an apocalyptic number.

139543 is a deficient number, since it is larger than the sum of its proper divisors (3017).

139543 is an equidigital number, since it uses as much as digits as its factorization.

139543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016.

The product of its digits is 1620, while the sum is 25.

The square root of 139543 is about 373.5545475563. The cubic root of 139543 is about 51.8683801491.

The spelling of 139543 in words is "one hundred thirty-nine thousand, five hundred forty-three".