204905387 has 4 divisors (see below), whose sum is σ = 211971120. Its totient is φ = 197839656.

The previous prime is 204905359. The next prime is 204905399. The reversal of 204905387 is 783509402.

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 204905387 - 2¹⁰ = 204904363 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 204905387.

It is not an unprimeable number, because it can be changed into a prime (204905317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3532823 + ... + 3532880.

It is an arithmetic number, because the mean of its divisors is an integer number (52992780).

Almost surely, 2^204905387 is an apocalyptic number.

204905387 is a deficient number, since it is larger than the sum of its proper divisors (7065733).

204905387 is an equidigital number, since it uses as much as digits as its factorization.

204905387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065732.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 204905387 is about 14314.5166526851. The cubic root of 204905387 is about 589.5461289624.

The spelling of 204905387 in words is "two hundred four million, nine hundred five thousand, three hundred eighty-seven".