843040 has 48 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 305920.

The previous prime is 842993. The next prime is 843043. The reversal of 843040 is 40348.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 842999 and 843017.

It is not an unprimeable number, because it can be changed into a prime (843043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1521 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁸⁴³⁰⁴⁰ is an apocalyptic number.

843040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 843040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

843040 is an abundant number, since it is smaller than the sum of its proper divisors (1334240).

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

843040 is a wasteful number, since it uses less digits than its factorization.

843040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 843040 is about 918.1720971583. The cubic root of 843040 is about 94.4675662984.

Adding to 843040 its reverse (40348), we get a palindrome (883388).

The spelling of 843040 in words is "eight hundred forty-three thousand, forty".