204858 has 24 divisors (see below), whose sum is σ = 468000. Its totient is φ = 64584.

The previous prime is 204857. The next prime is 204859. The reversal of 204858 is 858402.

It is an interprime number because it is at equal distance from previous prime (204857) and next prime (204859).

It is not an unprimeable number, because it can be changed into a prime (204857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (19500).

2²⁰⁴⁸⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234000).

204858 is an abundant number, since it is smaller than the sum of its proper divisors (263142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204858 is a wasteful number, since it uses less digits than its factorization.

204858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 204858 is about 452.6124169751. The cubic root of 204858 is about 58.9500678756.

The spelling of 204858 in words is "two hundred four thousand, eight hundred fifty-eight".