204123247 has 4 divisors (see below), whose sum is σ = 204153840. Its totient is φ = 204092656.

The previous prime is 204123221. The next prime is 204123253. The reversal of 204123247 is 742321402.

It is a happy number.

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 204123247 - 2⁷ = 204123119 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 (204123217) 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, 547 + ... + 20212.

It is an arithmetic number, because the mean of its divisors is an integer number (51038460).

Almost surely, 2^204123247 is an apocalyptic number.

204123247 is a deficient number, since it is larger than the sum of its proper divisors (30593).

204123247 is an equidigital number, since it uses as much as digits as its factorization.

204123247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30592.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 204123247 is about 14287.1707136158. The cubic root of 204123247 is about 588.7950578492.

Adding to 204123247 its reverse (742321402), we get a palindrome (946444649).

The spelling of 204123247 in words is "two hundred four million, one hundred twenty-three thousand, two hundred forty-seven".