204312123 has 12 divisors (see below), whose sum is σ = 296128560. Its totient is φ = 135741456.

The previous prime is 204312109. The next prime is 204312131. The reversal of 204312123 is 321213402.

204312123 is a `hidden beast` number, since 20 + 431 + 212 + 3 = 666.

It is not a de Polignac number, because 204312123 - 2²⁶ = 137203259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204312096 and 204312105.

It is not an unprimeable number, because it can be changed into a prime (204312323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36103 + ... + 41376.

It is an arithmetic number, because the mean of its divisors is an integer number (24677380).

Almost surely, 2^204312123 is an apocalyptic number.

204312123 is a deficient number, since it is larger than the sum of its proper divisors (91816437).

204312123 is a wasteful number, since it uses less digits than its factorization.

204312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77778 (or 77775 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 204312123 is about 14293.7791713738. The cubic root of 204312123 is about 588.9766066175.

Adding to 204312123 its reverse (321213402), we get a palindrome (525525525).

The spelling of 204312123 in words is "two hundred four million, three hundred twelve thousand, one hundred twenty-three".