204016409 has 8 divisors (see below), whose sum is σ = 209708928. Its totient is φ = 198333360.

The previous prime is 204016399. The next prime is 204016411. The reversal of 204016409 is 904610402.

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 204016409 - 2²⁰ = 202967833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204036409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83414 + ... + 85824.

It is an arithmetic number, because the mean of its divisors is an integer number (26213616).

Almost surely, 2^204016409 is an apocalyptic number.

It is an amenable number.

204016409 is a deficient number, since it is larger than the sum of its proper divisors (5692519).

204016409 is a wasteful number, since it uses less digits than its factorization.

204016409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4735.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 204016409 is about 14283.4312754324. The cubic root of 204016409 is about 588.6923149142.

The spelling of 204016409 in words is "two hundred four million, sixteen thousand, four hundred nine".