204400405 has 8 divisors (see below), whose sum is σ = 267578784. Its totient is φ = 148654800.

The previous prime is 204400373. The next prime is 204400411. The reversal of 204400405 is 504004402.

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

It is not a de Polignac number, because 204400405 - 2⁵ = 204400373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1858131 + ... + 1858240.

It is an arithmetic number, because the mean of its divisors is an integer number (33447348).

Almost surely, 2^204400405 is an apocalyptic number.

It is an amenable number.

204400405 is a deficient number, since it is larger than the sum of its proper divisors (63178379).

204400405 is a wasteful number, since it uses less digits than its factorization.

204400405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716387.

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

The square root of 204400405 is about 14296.8669644786. The cubic root of 204400405 is about 589.0614254472.

Adding to 204400405 its reverse (504004402), we get a palindrome (708404807).

The spelling of 204400405 in words is "two hundred four million, four hundred thousand, four hundred five".