204730409 has 8 divisors (see below), whose sum is σ = 221360832. Its totient is φ = 188226000.

The previous prime is 204730403. The next prime is 204730499. The reversal of 204730409 is 904037402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204730409 - 2²⁰ = 203681833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204730403) 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 7 ways as a sum of consecutive naturals, for example, 28109 + ... + 34634.

It is an arithmetic number, because the mean of its divisors is an integer number (27670104).

Almost surely, 2^204730409 is an apocalyptic number.

It is an amenable number.

204730409 is a deficient number, since it is larger than the sum of its proper divisors (16630423).

204730409 is a wasteful number, since it uses less digits than its factorization.

204730409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63007.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 204730409 is about 14308.4034399370. The cubic root of 204730409 is about 589.3782677824.

The spelling of 204730409 in words is "two hundred four million, seven hundred thirty thousand, four hundred nine".