843940 has 12 divisors (see below), whose sum is σ = 1772316. Its totient is φ = 337568.

The previous prime is 843911. The next prime is 844001. The reversal of 843940 is 49348.

It can be written as a sum of positive squares in 2 ways, for example, as 178084 + 665856 = 422^2 + 816^2 .

It is a junction number, because it is equal to n+sod(n) for n = 843899 and 843908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21079 + ... + 21118.

It is an arithmetic number, because the mean of its divisors is an integer number (147693).

2⁸⁴³⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

843940 is an abundant number, since it is smaller than the sum of its proper divisors (928376).

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

843940 is a wasteful number, since it uses less digits than its factorization.

843940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42206 (or 42204 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 843940 is about 918.6620706223. The cubic root of 843940 is about 94.5011710987.

The spelling of 843940 in words is "eight hundred forty-three thousand, nine hundred forty".