842820 has 48 divisors (see below), whose sum is σ = 2576448. Its totient is φ = 204160.

The previous prime is 842819. The next prime is 842857. The reversal of 842820 is 28248.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (53676).

2⁸⁴²⁸²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288224).

842820 is an abundant number, since it is smaller than the sum of its proper divisors (1733628).

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

842820 is a wasteful number, since it uses less digits than its factorization.

842820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 842820 is about 918.0522860927. The cubic root of 842820 is about 94.4593481542.

It can be divided in two parts, 8428 and 20, that added together give a palindrome (8448).

The spelling of 842820 in words is "eight hundred forty-two thousand, eight hundred twenty".