284866 has 4 divisors (see below), whose sum is σ = 427302. Its totient is φ = 142432.

The previous prime is 284857. The next prime is 284881. The reversal of 284866 is 668482.

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., 207025 + 77841 = 455^2 + 279^2 .

It is a super-2 number, since 2×284866² = 162297275912, which contains 22 as substring.

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, 71215 + ... + 71218.

2²⁸⁴⁸⁶⁶ is an apocalyptic number.

284866 is a deficient number, since it is larger than the sum of its proper divisors (142436).

284866 is a wasteful number, since it uses less digits than its factorization.

284866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142435.

The product of its digits is 18432, while the sum is 34.

The square root of 284866 is about 533.7283953473. The cubic root of 284866 is about 65.7981281976.

The spelling of 284866 in words is "two hundred eighty-four thousand, eight hundred sixty-six".