861284 has 12 divisors (see below), whose sum is σ = 1516284. Its totient is φ = 428064.

The previous prime is 861239. The next prime is 861293. The reversal of 861284 is 482168.

It can be written as a sum of positive squares in 2 ways, for example, as 846400 + 14884 = 920^2 + 122^2 .

It is an unprimeable number.

861284 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (126357).

2⁸⁶¹²⁸⁴ is an apocalyptic number.

It is an amenable number.

861284 is a deficient number, since it is larger than the sum of its proper divisors (655000).

861284 is a wasteful number, since it uses less digits than its factorization.

861284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1292 counting only the distinct ones).

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

The square root of 861284 is about 928.0538777463. The cubic root of 861284 is about 95.1441578681.

The spelling of 861284 in words is "eight hundred sixty-one thousand, two hundred eighty-four".