843872820 has 96 divisors (see below), whose sum is σ = 2726750208. Its totient is φ = 191002752.

The previous prime is 843872797. The next prime is 843872849. The reversal of 843872820 is 28278348.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33507 + ... + 53013.

It is an arithmetic number, because the mean of its divisors is an integer number (28403648).

Almost surely, 2^843872820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 843872820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1363375104).

843872820 is an abundant number, since it is smaller than the sum of its proper divisors (1882877388).

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

843872820 is a wasteful number, since it uses less digits than its factorization.

843872820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19629 (or 19627 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 843872820 is about 29049.4891521348. The cubic root of 843872820 is about 944.9866351235.

The spelling of 843872820 in words is "eight hundred forty-three million, eight hundred seventy-two thousand, eight hundred twenty".