9878 has 8 divisors (see below), whose sum is σ = 16200. Its totient is φ = 4480.

The previous prime is 9871. The next prime is 9883. The reversal of 9878 is 8789.

9878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

9878 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is an alternating number because its digits alternate between odd and even.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203 + ... + 246.

It is an arithmetic number, because the mean of its divisors is an integer number (2025).

2⁹⁸⁷⁸ is an apocalyptic number.

9878 is a deficient number, since it is larger than the sum of its proper divisors (6322).

9878 is a wasteful number, since it uses less digits than its factorization.

9878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462.

The product of its digits is 4032, while the sum is 32.

The square root of 9878 is about 99.3881280637. The cubic root of 9878 is about 21.4563744926.

Subtracting from 9878 its reverse (8789), we obtain a square (1089 = 33²).

The spelling of 9878 in words is "nine thousand, eight hundred seventy-eight".