9879 has 8 divisors (see below), whose sum is σ = 13680. Its totient is φ = 6336.

The previous prime is 9871. The next prime is 9883. The reversal of 9879 is 9789.

9879 = T₂ + T₃ + ... + T₃₈.

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

It is not a de Polignac number, because 9879 - 2³ = 9871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 155.

It is an arithmetic number, because the mean of its divisors is an integer number (1710).

2⁹⁸⁷⁹ is an apocalyptic number.

9879 is a deficient number, since it is larger than the sum of its proper divisors (3801).

9879 is a wasteful number, since it uses less digits than its factorization.

9879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129.

The product of its digits is 4536, while the sum is 33.

The square root of 9879 is about 99.3931587183. The cubic root of 9879 is about 21.4570985140.

It can be divided in two parts, 9 and 879, that added together give a palindrome (888).

The spelling of 9879 in words is "nine thousand, eight hundred seventy-nine".