204986 has 8 divisors (see below), whose sum is σ = 325620. Its totient is φ = 96448.

The previous prime is 204983. The next prime is 205019. The reversal of 204986 is 689402.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 32761 = 415^2 + 181^2 .

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

It is not an unprimeable number, because it can be changed into a prime (204983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2981 + ... + 3048.

2²⁰⁴⁹⁸⁶ is an apocalyptic number.

204986 is a deficient number, since it is larger than the sum of its proper divisors (120634).

204986 is a wasteful number, since it uses less digits than its factorization.

204986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048.

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

The square root of 204986 is about 452.7537962293. The cubic root of 204986 is about 58.9623431064.

Subtracting 204986 from its reverse (689402), we obtain a square (484416 = 696²).

The spelling of 204986 in words is "two hundred four thousand, nine hundred eighty-six".