991839882 has 32 divisors (see below), whose sum is σ = 2165289984. Its totient is φ = 300380400.

The previous prime is 991839851. The next prime is 991839899. The reversal of 991839882 is 288938199.

991839882 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147657 + ... + 154227.

It is an arithmetic number, because the mean of its divisors is an integer number (67665312).

Almost surely, 2^991839882 is an apocalyptic number.

991839882 is an abundant number, since it is smaller than the sum of its proper divisors (1173450102).

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

991839882 is a wasteful number, since it uses less digits than its factorization.

991839882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8874.

The product of its digits is 2239488, while the sum is 57.

The square root of 991839882 is about 31493.4895176765. The cubic root of 991839882 is about 997.2725283283.

The spelling of 991839882 in words is "nine hundred ninety-one million, eight hundred thirty-nine thousand, eight hundred eighty-two".