284861 has 4 divisors (see below), whose sum is σ = 287232. Its totient is φ = 282492.

The previous prime is 284857. The next prime is 284881. The reversal of 284861 is 168482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 284861 - 2² = 284857 is a prime.

It is a super-2 number, since 2×284861² = 162291578642, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (284831) 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, 995 + ... + 1248.

It is an arithmetic number, because the mean of its divisors is an integer number (71808).

2²⁸⁴⁸⁶¹ is an apocalyptic number.

It is an amenable number.

284861 is a deficient number, since it is larger than the sum of its proper divisors (2371).

284861 is a wasteful number, since it uses less digits than its factorization.

284861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its digits is 3072, while the sum is 29.

The square root of 284861 is about 533.7237112964. The cubic root of 284861 is about 65.7977432300.

The spelling of 284861 in words is "two hundred eighty-four thousand, eight hundred sixty-one".