843428 has 6 divisors (see below), whose sum is σ = 1476006. Its totient is φ = 421712.

The previous prime is 843397. The next prime is 843443. The reversal of 843428 is 824348.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 238144 = 778^2 + 488^2 .

It is a super-2 number, since 2×843428² = 1422741582368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 843428.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 843428.

It is an unprimeable number.

843428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105425 + ... + 105432.

It is an arithmetic number, because the mean of its divisors is an integer number (246001).

2⁸⁴³⁴²⁸ is an apocalyptic number.

It is an amenable number.

843428 is a deficient number, since it is larger than the sum of its proper divisors (632578).

843428 is a wasteful number, since it uses less digits than its factorization.

843428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210861 (or 210859 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 843428 is about 918.3833622186. The cubic root of 843428 is about 94.4820566326.

The spelling of 843428 in words is "eight hundred forty-three thousand, four hundred twenty-eight".