123543 has 24 divisors (see below), whose sum is σ = 213408. Its totient is φ = 67392.

The previous prime is 123527. The next prime is 123547. The reversal of 123543 is 345321.

123543 is a `hidden beast` number, since 123 + 543 = 666.

It is not a de Polignac number, because 123543 - 2⁴ = 123527 is a prime.

123543 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2305 + ... + 2357.

It is an arithmetic number, because the mean of its divisors is an integer number (8892).

2¹²³⁵⁴³ is an apocalyptic number.

123543 is a deficient number, since it is larger than the sum of its proper divisors (89865).

123543 is a wasteful number, since it uses less digits than its factorization.

123543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 100 counting only the distinct ones).

The product of its digits is 360, while the sum is 18.

The square root of 123543 is about 351.4868418590. The cubic root of 123543 is about 49.8049736166.

Adding to 123543 its reverse (345321), we get a palindrome (468864).

It can be divided in two parts, 123 and 543, that added together give a palindrome (666).

The spelling of 123543 in words is "one hundred twenty-three thousand, five hundred forty-three".