204861 has 8 divisors (see below), whose sum is σ = 285120. Its totient is φ = 130592.

The previous prime is 204859. The next prime is 204871. The reversal of 204861 is 168402.

204861 is nontrivially palindromic in base 13.

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

It is a cyclic number.

It is not a de Polignac number, because 204861 - 2¹ = 204859 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204821) 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, 1416 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (35640).

2²⁰⁴⁸⁶¹ is an apocalyptic number.

It is an amenable number.

204861 is a deficient number, since it is larger than the sum of its proper divisors (80259).

204861 is a wasteful number, since it uses less digits than its factorization.

204861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 204861 is about 452.6157310567. The cubic root of 204861 is about 58.9503556348.

The spelling of 204861 in words is "two hundred four thousand, eight hundred sixty-one".