204040405 has 8 divisors (see below), whose sum is σ = 244941984. Its totient is φ = 163170000.

The previous prime is 204040399. The next prime is 204040423. The reversal of 204040405 is 504040402.

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

It is not a de Polignac number, because 204040405 - 2⁹ = 204039893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 10530 + ... + 22780.

It is an arithmetic number, because the mean of its divisors is an integer number (30617748).

Almost surely, 2^204040405 is an apocalyptic number.

It is an amenable number.

204040405 is a deficient number, since it is larger than the sum of its proper divisors (40901579).

204040405 is a wasteful number, since it uses less digits than its factorization.

204040405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15587.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 204040405 is about 14284.2712449743. The cubic root of 204040405 is about 588.7153942783.

Adding to 204040405 its reverse (504040402), we get a palindrome (708080807).

The spelling of 204040405 in words is "two hundred four million, forty thousand, four hundred five".