9789427978 has 32 divisors (see below), whose sum is σ = 16718218560. Its totient is φ = 4258248960.

The previous prime is 9789427961. The next prime is 9789427979. The reversal of 9789427978 is 8797249879.

9789427978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9789427979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4201 + ... + 139987.

It is an arithmetic number, because the mean of its divisors is an integer number (522444330).

Almost surely, 2^9789427978 is an apocalyptic number.

9789427978 is a deficient number, since it is larger than the sum of its proper divisors (6928790582).

9789427978 is a wasteful number, since it uses less digits than its factorization.

9789427978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135942.

The product of its digits is 128024064, while the sum is 70.

The square root of 9789427978 is about 98941.5381829088. The cubic root of 9789427978 is about 2139.2051651226.

The spelling of 9789427978 in words is "nine billion, seven hundred eighty-nine million, four hundred twenty-seven thousand, nine hundred seventy-eight".