842556 has 48 divisors (see below), whose sum is σ = 2314368. Its totient is φ = 235200.

The previous prime is 842551. The next prime is 842581. The reversal of 842556 is 655248.

It is a super-2 number, since 2×842556² = 1419801226272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842551) by changing a digit.

842556 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 15 ways as a sum of consecutive naturals, for example, 1471 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (48216).

2⁸⁴²⁵⁵⁶ is an apocalyptic number.

842556 is the 491-st nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157184).

842556 is an abundant number, since it is smaller than the sum of its proper divisors (1471812).

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

842556 is a wasteful number, since it uses less digits than its factorization.

842556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 520 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 842556 is about 917.9084921712. The cubic root of 842556 is about 94.4494844933.

The spelling of 842556 in words is "eight hundred forty-two thousand, five hundred fifty-six".