821040843 has 16 divisors (see below), whose sum is σ = 1251901440. Its totient is φ = 468869376.

The previous prime is 821040827. The next prime is 821040877. The reversal of 821040843 is 348040128.

It is not a de Polignac number, because 821040843 - 2⁴ = 821040827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 821040843.

It is not an unprimeable number, because it can be changed into a prime (821040893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24118 + ... + 47156.

It is an arithmetic number, because the mean of its divisors is an integer number (78243840).

Almost surely, 2^821040843 is an apocalyptic number.

821040843 is a deficient number, since it is larger than the sum of its proper divisors (430860597).

821040843 is a wasteful number, since it uses less digits than its factorization.

821040843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24746.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 821040843 is about 28653.8102701892. The cubic root of 821040843 is about 936.3860187776.

The spelling of 821040843 in words is "eight hundred twenty-one million, forty thousand, eight hundred forty-three".