204378861 has 8 divisors (see below), whose sum is σ = 279870304. Its totient is φ = 132570000.

The previous prime is 204378829. The next prime is 204378899. The reversal of 204378861 is 168873402.

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

It is not a de Polignac number, because 204378861 - 2⁵ = 204378829 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 (204378661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920515 + ... + 920736.

It is an arithmetic number, because the mean of its divisors is an integer number (34983788).

Almost surely, 2^204378861 is an apocalyptic number.

It is an amenable number.

204378861 is a deficient number, since it is larger than the sum of its proper divisors (75491443).

204378861 is a wasteful number, since it uses less digits than its factorization.

204378861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841291.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 204378861 is about 14296.1134928343. The cubic root of 204378861 is about 589.0407288391.

The spelling of 204378861 in words is "two hundred four million, three hundred seventy-eight thousand, eight hundred sixty-one".