9979878 has 16 divisors (see below), whose sum is σ = 20056896. Its totient is φ = 3310440.

The previous prime is 9979877. The next prime is 9979889. The reversal of 9979878 is 8789799.

It is a happy number.

9979878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979877) 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, 2676 + ... + 5207.

It is an arithmetic number, because the mean of its divisors is an integer number (1253556).

Almost surely, 2^9979878 is an apocalyptic number.

9979878 is an abundant number, since it is smaller than the sum of its proper divisors (10077018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9979878 is a wasteful number, since it uses less digits than its factorization.

9979878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8099.

The product of its digits is 2286144, while the sum is 57.

The square root of 9979878 is about 3159.0944905146. The cubic root of 9979878 is about 215.2988668542.

The spelling of 9979878 in words is "nine million, nine hundred seventy-nine thousand, eight hundred seventy-eight".