204869 has 12 divisors (see below), whose sum is σ = 246924. Its totient is φ = 169344.

The previous prime is 204859. The next prime is 204871. The reversal of 204869 is 968402.

It can be written as a sum of positive squares in 2 ways, for example, as 82369 + 122500 = 287^2 + 350^2 .

It is not a de Polignac number, because 204869 - 2⁸ = 204613 is a prime.

It is a super-2 number, since 2×204869² = 83942614322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1757 + ... + 1869.

It is an arithmetic number, because the mean of its divisors is an integer number (20577).

2²⁰⁴⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

204869 is a deficient number, since it is larger than the sum of its proper divisors (42055).

204869 is a wasteful number, since it uses less digits than its factorization.

204869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 204869 is about 452.6245684892. The cubic root of 204869 is about 58.9511229791.

The spelling of 204869 in words is "two hundred four thousand, eight hundred sixty-nine".