9147978 has 48 divisors (see below), whose sum is σ = 23499840. Its totient is φ = 2612736.

The previous prime is 9147977. The next prime is 9148001. The reversal of 9147978 is 8797419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9147977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2058 + ... + 4746.

It is an arithmetic number, because the mean of its divisors is an integer number (489580).

Almost surely, 2^9147978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9147978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11749920).

9147978 is an abundant number, since it is smaller than the sum of its proper divisors (14351862).

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

9147978 is a wasteful number, since it uses less digits than its factorization.

9147978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713 (or 2701 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 9147978 is about 3024.5624476939. The cubic root of 9147978 is about 209.1422152723.

The spelling of 9147978 in words is "nine million, one hundred forty-seven thousand, nine hundred seventy-eight".