811984879242 has 80 divisors (see below), whose sum is σ = 1927061642880. Its totient is φ = 254662641792.

The previous prime is 811984879241. The next prime is 811984879261. The reversal of 811984879242 is 242978489118.

It is a self number, because there is not a number n which added to its sum of digits gives 811984879242.

It is not an unprimeable number, because it can be changed into a prime (811984879241) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9339609 + ... + 9426147.

It is an arithmetic number, because the mean of its divisors is an integer number (24088270536).

Almost surely, 2^811984879242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811984879242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963530821440).

811984879242 is an abundant number, since it is smaller than the sum of its proper divisors (1115076763638).

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

811984879242 is a wasteful number, since it uses less digits than its factorization.

811984879242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89977 (or 89968 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 63.

The spelling of 811984879242 in words is "eight hundred eleven billion, nine hundred eighty-four million, eight hundred seventy-nine thousand, two hundred forty-two".