999842 has 8 divisors (see below), whose sum is σ = 1509456. Its totient is φ = 496692.

The previous prime is 999809. The next prime is 999853. The reversal of 999842 is 248999.

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

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999842.

It is an unprimeable number.

999842 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1208 + ... + 1859.

It is an arithmetic number, because the mean of its divisors is an integer number (188682).

2⁹⁹⁹⁸⁴² is an apocalyptic number.

999842 is a deficient number, since it is larger than the sum of its proper divisors (509614).

999842 is a wasteful number, since it uses less digits than its factorization.

999842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232.

The product of its digits is 46656, while the sum is 41.

The square root of 999842 is about 999.9209968793. The cubic root of 999842 is about 99.9947330559.

The spelling of 999842 in words is "nine hundred ninety-nine thousand, eight hundred forty-two".