991839862 has 16 divisors (see below), whose sum is σ = 1686530160. Its totient is φ = 433678752.

The previous prime is 991839851. The next prime is 991839899. The reversal of 991839862 is 268938199.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1003393 + ... + 1004380.

It is an arithmetic number, because the mean of its divisors is an integer number (105408135).

Almost surely, 2^991839862 is an apocalyptic number.

991839862 is a deficient number, since it is larger than the sum of its proper divisors (694690298).

991839862 is a wasteful number, since it uses less digits than its factorization.

991839862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007807.

The product of its digits is 1679616, while the sum is 55.

The square root of 991839862 is about 31493.4892001506. The cubic root of 991839862 is about 997.2725216251.

The spelling of 991839862 in words is "nine hundred ninety-one million, eight hundred thirty-nine thousand, eight hundred sixty-two".