9890789 has 2 divisors, whose sum is σ = 9890790. Its totient is φ = 9890788.

The previous prime is 9890761. The next prime is 9890791. The reversal of 9890789 is 9870989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 588289 = 3050^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 9890789 - 2¹⁶ = 9825253 is a prime.

Together with 9890791, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9892789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945394 + 4945395.

It is an arithmetic number, because the mean of its divisors is an integer number (4945395).

Almost surely, 2^9890789 is an apocalyptic number.

It is an amenable number.

9890789 is a deficient number, since it is larger than the sum of its proper divisors (1).

9890789 is an equidigital number, since it uses as much as digits as its factorization.

9890789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9890789 is about 3144.9624799034. The cubic root of 9890789 is about 214.6563032153.

The spelling of 9890789 in words is "nine million, eight hundred ninety thousand, seven hundred eighty-nine".