864842 has 16 divisors (see below), whose sum is σ = 1490400. Its totient is φ = 372240.

The previous prime is 864817. The next prime is 864883. The reversal of 864842 is 248468.

It is a junction number, because it is equal to n+sod(n) for n = 864799 and 864808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617 + ... + 1452.

It is an arithmetic number, because the mean of its divisors is an integer number (93150).

2⁸⁶⁴⁸⁴² is an apocalyptic number.

864842 is a deficient number, since it is larger than the sum of its proper divisors (625558).

864842 is a wasteful number, since it uses less digits than its factorization.

864842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101.

The product of its digits is 12288, while the sum is 32.

The square root of 864842 is about 929.9688166815. The cubic root of 864842 is about 95.2749926953.

The spelling of 864842 in words is "eight hundred sixty-four thousand, eight hundred forty-two".