9978289 has 2 divisors, whose sum is σ = 9978290. Its totient is φ = 9978288.

The previous prime is 9978281. The next prime is 9978301. The reversal of 9978289 is 9828799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8065600 + 1912689 = 2840^2 + 1383^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978289 - 2³ = 9978281 is a prime.

It is not a weakly prime, because it can be changed into another prime (9978281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989144 + 4989145.

It is an arithmetic number, because the mean of its divisors is an integer number (4989145).

Almost surely, 2^9978289 is an apocalyptic number.

It is an amenable number.

9978289 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978289 is an equidigital number, since it uses as much as digits as its factorization.

9978289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 52.

The square root of 9978289 is about 3158.8429843853. The cubic root of 9978289 is about 215.2874395916.

The spelling of 9978289 in words is "nine million, nine hundred seventy-eight thousand, two hundred eighty-nine".