9999842 has 16 divisors (see below), whose sum is σ = 16313400. Its totient is φ = 4578048.

The previous prime is 9999823. The next prime is 9999863. The reversal of 9999842 is 2489999.

It can be written as a sum of positive squares in 4 ways, for example, as 9991921 + 7921 = 3161^2 + 89^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2717 + ... + 5232.

Almost surely, 2^9999842 is an apocalyptic number.

9999842 is a deficient number, since it is larger than the sum of its proper divisors (6313558).

9999842 is a wasteful number, since it uses less digits than its factorization.

9999842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8005.

The product of its digits is 419904, while the sum is 50.

The square root of 9999842 is about 3162.2526780762. The cubic root of 9999842 is about 215.4423343283.

The spelling of 9999842 in words is "nine million, nine hundred ninety-nine thousand, eight hundred forty-two".