9879831 has 12 divisors (see below), whose sum is σ = 15368808. Its totient is φ = 6079824.

The previous prime is 9879827. The next prime is 9879871. The reversal of 9879831 is 1389789.

It is not a de Polignac number, because 9879831 - 2² = 9879827 is a prime.

It is a super-2 number, since 2×9879831² = 195222121177122, which contains 22 as substring.

9879831 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9879871) 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 11 ways as a sum of consecutive naturals, for example, 42105 + ... + 42338.

It is an arithmetic number, because the mean of its divisors is an integer number (1280734).

Almost surely, 2^9879831 is an apocalyptic number.

9879831 is a deficient number, since it is larger than the sum of its proper divisors (5488977).

9879831 is a wasteful number, since it uses less digits than its factorization.

9879831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84462 (or 84459 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9879831 is about 3143.2198459541. The cubic root of 9879831 is about 214.5770013862.

The spelling of 9879831 in words is "nine million, eight hundred seventy-nine thousand, eight hundred thirty-one".