9947779 has 2 divisors, whose sum is σ = 9947780. Its totient is φ = 9947778.

The previous prime is 9947761. The next prime is 9947803. The reversal of 9947779 is 9777499.

9947779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9947779 - 2²¹ = 7850627 is a prime.

It is not a weakly prime, because it can be changed into another prime (9947719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973889 + 4973890.

It is an arithmetic number, because the mean of its divisors is an integer number (4973890).

Almost surely, 2^9947779 is an apocalyptic number.

9947779 is a deficient number, since it is larger than the sum of its proper divisors (1).

9947779 is an equidigital number, since it uses as much as digits as its factorization.

9947779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000188, while the sum is 52.

The square root of 9947779 is about 3154.0099873019. The cubic root of 9947779 is about 215.0677918546.

The spelling of 9947779 in words is "nine million, nine hundred forty-seven thousand, seven hundred seventy-nine".