842684 has 6 divisors (see below), whose sum is σ = 1474704. Its totient is φ = 421340.

The previous prime is 842657. The next prime is 842701. The reversal of 842684 is 486248.

It is a self number, because there is not a number n which added to its sum of digits gives 842684.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 842684.

It is an unprimeable number.

842684 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105332 + ... + 105339.

It is an arithmetic number, because the mean of its divisors is an integer number (245784).

2⁸⁴²⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

842684 is a deficient number, since it is larger than the sum of its proper divisors (632020).

842684 is a wasteful number, since it uses less digits than its factorization.

842684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210675 (or 210673 counting only the distinct ones).

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

The square root of 842684 is about 917.9782132491. The cubic root of 842684 is about 94.4542671316.

It can be divided in two parts, 84 and 2684, that multiplied together give a triangular number (225456 = T₆₇₁).

The spelling of 842684 in words is "eight hundred forty-two thousand, six hundred eighty-four".