819943884 has 60 divisors (see below), whose sum is σ = 2172920904. Its totient is φ = 269562816.

The previous prime is 819943853. The next prime is 819943897. The reversal of 819943884 is 488349918.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 819943884.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6319 + ... + 40985.

Almost surely, 2^819943884 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 819943884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086460452).

819943884 is an abundant number, since it is smaller than the sum of its proper divisors (1352977020).

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

819943884 is a wasteful number, since it uses less digits than its factorization.

819943884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34756 (or 34745 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 819943884 is about 28634.6622819268. The cubic root of 819943884 is about 935.9688105978.

The spelling of 819943884 in words is "eight hundred nineteen million, nine hundred forty-three thousand, eight hundred eighty-four".