863824 has 20 divisors (see below), whose sum is σ = 1802836. Its totient is φ = 398592.

The previous prime is 863803. The next prime is 863833. The reversal of 863824 is 428368.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53824 + 810000 = 232^2 + 900^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1869 + ... + 2284.

2⁸⁶³⁸²⁴ is an apocalyptic number.

It is an amenable number.

863824 is an abundant number, since it is smaller than the sum of its proper divisors (939012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863824 is a wasteful number, since it uses less digits than its factorization.

863824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174 (or 4168 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 863824 is about 929.4213253417. The cubic root of 863824 is about 95.2375954894.

The spelling of 863824 in words is "eight hundred sixty-three thousand, eight hundred twenty-four".