991892 has 12 divisors (see below), whose sum is σ = 1893696. Its totient is φ = 450840.

The previous prime is 991889. The next prime is 991901. The reversal of 991892 is 298199.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991892.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11228 + ... + 11315.

It is an arithmetic number, because the mean of its divisors is an integer number (157808).

2⁹⁹¹⁸⁹² is an apocalyptic number.

It is an amenable number.

991892 is a deficient number, since it is larger than the sum of its proper divisors (901804).

991892 is a wasteful number, since it uses less digits than its factorization.

991892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22558 (or 22556 counting only the distinct ones).

The product of its digits is 11664, while the sum is 38.

The square root of 991892 is about 995.9377490586. The cubic root of 991892 is about 99.7289995845.

It can be divided in two parts, 99 and 1892, that added together give a palindrome (1991).

The spelling of 991892 in words is "nine hundred ninety-one thousand, eight hundred ninety-two".