978019992 has 96 divisors (see below), whose sum is σ = 2792724480. Its totient is φ = 308744640.

The previous prime is 978019981. The next prime is 978019997. The reversal of 978019992 is 299910879.

978019992 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 (978019997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100243 + ... + 109565.

It is an arithmetic number, because the mean of its divisors is an integer number (29090880).

Almost surely, 2^978019992 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 978019992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396362240).

978019992 is an abundant number, since it is smaller than the sum of its proper divisors (1814704488).

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

978019992 is a wasteful number, since it uses less digits than its factorization.

978019992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9413 (or 9406 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The square root of 978019992 is about 31273.3111774241. The cubic root of 978019992 is about 992.6189853268.

The spelling of 978019992 in words is "nine hundred seventy-eight million, nineteen thousand, nine hundred ninety-two".