9729978 has 24 divisors (see below), whose sum is σ = 19788288. Its totient is φ = 3189312.

The previous prime is 9729961. The next prime is 9729983. The reversal of 9729978 is 8799279.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9729978.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76551 + ... + 76677.

It is an arithmetic number, because the mean of its divisors is an integer number (824512).

Almost surely, 2^9729978 is an apocalyptic number.

9729978 is an abundant number, since it is smaller than the sum of its proper divisors (10058310).

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

9729978 is a wasteful number, since it uses less digits than its factorization.

9729978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 245 counting only the distinct ones).

The product of its digits is 571536, while the sum is 51.

The square root of 9729978 is about 3119.2912656564. The cubic root of 9729978 is about 213.4865993889.

The spelling of 9729978 in words is "nine million, seven hundred twenty-nine thousand, nine hundred seventy-eight".