204791887 has 4 divisors (see below), whose sum is σ = 204981376. Its totient is φ = 204602400.

The previous prime is 204791869. The next prime is 204791927. The reversal of 204791887 is 788197402.

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 204791887 - 2¹¹ = 204789839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204791837) 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, 93114 + ... + 95287.

It is an arithmetic number, because the mean of its divisors is an integer number (51245344).

Almost surely, 2^204791887 is an apocalyptic number.

204791887 is a deficient number, since it is larger than the sum of its proper divisors (189489).

204791887 is a wasteful number, since it uses less digits than its factorization.

204791887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189488.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 204791887 is about 14310.5515966367. The cubic root of 204791887 is about 589.4372562038.

It can be divided in two parts, 20479 and 1887, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 204791887 in words is "two hundred four million, seven hundred ninety-one thousand, eight hundred eighty-seven".