843240 has 32 divisors (see below), whose sum is σ = 2530080. Its totient is φ = 224832.

The previous prime is 843229. The next prime is 843253. The reversal of 843240 is 42348.

It is a happy number.

It is a super-2 number, since 2×843240² = 1422107395200, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 843240.

It is an unprimeable number.

843240 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 7 ways as a sum of consecutive naturals, for example, 3394 + ... + 3633.

It is an arithmetic number, because the mean of its divisors is an integer number (79065).

2⁸⁴³²⁴⁰ is an apocalyptic number.

It is an amenable number.

843240 is an abundant number, since it is smaller than the sum of its proper divisors (1686840).

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

843240 is a wasteful number, since it uses less digits than its factorization.

843240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041 (or 7037 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 843240 is about 918.2810027437. The cubic root of 843240 is about 94.4750360979.

Adding to 843240 its reverse (42348), we get a palindrome (885588).

The spelling of 843240 in words is "eight hundred forty-three thousand, two hundred forty".