991902 has 8 divisors (see below), whose sum is σ = 1983816. Its totient is φ = 330632.

The previous prime is 991901. The next prime is 991909. The reversal of 991902 is 209199.

It is a sphenic number, since it is the product of 3 distinct primes.

991902 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 991902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82653 + ... + 82664.

It is an arithmetic number, because the mean of its divisors is an integer number (247977).

2⁹⁹¹⁹⁰² is an apocalyptic number.

991902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

991902 is a wasteful number, since it uses less digits than its factorization.

991902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165322.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 991902 is about 995.9427694401. The cubic root of 991902 is about 99.7293347307.

The spelling of 991902 in words is "nine hundred ninety-one thousand, nine hundred two".