991242 has 24 divisors (see below), whose sum is σ = 2454816. Its totient is φ = 283176.

The previous prime is 991229. The next prime is 991261. The reversal of 991242 is 242199.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3808 + ... + 4059.

It is an arithmetic number, because the mean of its divisors is an integer number (102284).

2⁹⁹¹²⁴² is an apocalyptic number.

991242 is an abundant number, since it is smaller than the sum of its proper divisors (1463574).

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

991242 is a wasteful number, since it uses less digits than its factorization.

991242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882 (or 7879 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 991242 is about 995.6113699632. The cubic root of 991242 is about 99.7072102449.

The spelling of 991242 in words is "nine hundred ninety-one thousand, two hundred forty-two".