123243 has 4 divisors (see below), whose sum is σ = 164328. Its totient is φ = 82160.

The previous prime is 123239. The next prime is 123259. The reversal of 123243 is 342321.

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 123243 - 2² = 123239 is a prime.

It is a D-number.

123243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (123203) 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, 20538 + ... + 20543.

It is an arithmetic number, because the mean of its divisors is an integer number (41082).

2¹²³²⁴³ is an apocalyptic number.

123243 is a deficient number, since it is larger than the sum of its proper divisors (41085).

123243 is an equidigital number, since it uses as much as digits as its factorization.

123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41084.

The product of its digits is 144, while the sum is 15.

The square root of 123243 is about 351.0598239617. The cubic root of 123243 is about 49.7646270636.

Adding to 123243 its reverse (342321), we get a palindrome (465564).

It can be divided in two parts, 1232 and 43, that added together give a triangular number (1275 = T₅₀).

The spelling of 123243 in words is "one hundred twenty-three thousand, two hundred forty-three", and thus it is an iban number.