204868409 has 4 divisors (see below), whose sum is σ = 207461760. Its totient is φ = 202275060.

The previous prime is 204868397. The next prime is 204868423. The reversal of 204868409 is 904868402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204868409 - 2¹² = 204864313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204868009) 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, 1296557 + ... + 1296714.

It is an arithmetic number, because the mean of its divisors is an integer number (51865440).

Almost surely, 2^204868409 is an apocalyptic number.

It is an amenable number.

204868409 is a deficient number, since it is larger than the sum of its proper divisors (2593351).

204868409 is an equidigital number, since it uses as much as digits as its factorization.

204868409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593350.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 204868409 is about 14313.2249685387. The cubic root of 204868409 is about 589.5106629219.

The spelling of 204868409 in words is "two hundred four million, eight hundred sixty-eight thousand, four hundred nine".