9804391 has 2 divisors, whose sum is σ = 9804392. Its totient is φ = 9804390.

The previous prime is 9804343. The next prime is 9804397. The reversal of 9804391 is 1934089.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9804391 - 2¹¹ = 9802343 is a prime.

It is a super-2 number, since 2×9804391² = 192252165761762, which contains 22 as substring.

9804391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9804397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4902195 + 4902196.

It is an arithmetic number, because the mean of its divisors is an integer number (4902196).

Almost surely, 2^9804391 is an apocalyptic number.

9804391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9804391 is an equidigital number, since it uses as much as digits as its factorization.

9804391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 9804391 is about 3131.1964167072. The cubic root of 9804391 is about 214.0294526674.

The spelling of 9804391 in words is "nine million, eight hundred four thousand, three hundred ninety-one".