123243205 has 4 divisors (see below), whose sum is σ = 147891852. Its totient is φ = 98594560.

The previous prime is 123243191. The next prime is 123243209. The reversal of 123243205 is 502342321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59259204 + 63984001 = 7698^2 + 7999^2 .

It is not a de Polignac number, because 123243205 - 2⁵ = 123243173 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 (123243209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12324316 + ... + 12324325.

It is an arithmetic number, because the mean of its divisors is an integer number (36972963).

Almost surely, 2^123243205 is an apocalyptic number.

It is an amenable number.

123243205 is a deficient number, since it is larger than the sum of its proper divisors (24648647).

123243205 is an equidigital number, since it uses as much as digits as its factorization.

123243205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24648646.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 123243205 is about 11101.4956199604. The cubic root of 123243205 is about 497.6465465607.

Adding to 123243205 its reverse (502342321), we get a palindrome (625585526).

The spelling of 123243205 in words is "one hundred twenty-three million, two hundred forty-three thousand, two hundred five".