285218 has 4 divisors (see below), whose sum is σ = 427830. Its totient is φ = 142608.

The previous prime is 285199. The next prime is 285221. The reversal of 285218 is 812582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 190969 + 94249 = 437^2 + 307^2 .

It is a zygodrome in base 5.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 71303 + ... + 71306.

2²⁸⁵²¹⁸ is an apocalyptic number.

285218 is a deficient number, since it is larger than the sum of its proper divisors (142612).

285218 is a wasteful number, since it uses less digits than its factorization.

285218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142611.

The product of its digits is 1280, while the sum is 26.

The square root of 285218 is about 534.0580492793. The cubic root of 285218 is about 65.8252186049.

The spelling of 285218 in words is "two hundred eighty-five thousand, two hundred eighteen".