204345407 has 4 divisors (see below), whose sum is σ = 233537616. Its totient is φ = 175153200.

The previous prime is 204345403. The next prime is 204345451. The reversal of 204345407 is 704543402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204345407 - 2² = 204345403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204345407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204345403) 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, 14596094 + ... + 14596107.

It is an arithmetic number, because the mean of its divisors is an integer number (58384404).

Almost surely, 2^204345407 is an apocalyptic number.

204345407 is a deficient number, since it is larger than the sum of its proper divisors (29192209).

204345407 is an equidigital number, since it uses as much as digits as its factorization.

204345407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29192208.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 204345407 is about 14294.9434066736. The cubic root of 204345407 is about 589.0085878050.

Adding to 204345407 its reverse (704543402), we get a palindrome (908888809).

The spelling of 204345407 in words is "two hundred four million, three hundred forty-five thousand, four hundred seven".