9978980 has 48 divisors (see below), whose sum is σ = 23236416. Its totient is φ = 3569280.

The previous prime is 9978961. The next prime is 9978989. The reversal of 9978980 is 898799.

It is not an unprimeable number, because it can be changed into a prime (9978989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14402 + ... + 15078.

It is an arithmetic number, because the mean of its divisors is an integer number (484092).

Almost surely, 2^9978980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9978980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11618208).

9978980 is an abundant number, since it is smaller than the sum of its proper divisors (13257436).

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

9978980 is a wasteful number, since it uses less digits than its factorization.

9978980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9978980 is about 3158.9523579820. The cubic root of 9978980 is about 215.2924090537.

The spelling of 9978980 in words is "nine million, nine hundred seventy-eight thousand, nine hundred eighty".