989309 has 2 divisors, whose sum is σ = 989310. Its totient is φ = 989308.

The previous prime is 989293. The next prime is 989321. The reversal of 989309 is 903989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 77284 = 955^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 989309 - 2⁴ = 989293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989909) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494654 + 494655.

It is an arithmetic number, because the mean of its divisors is an integer number (494655).

2⁹⁸⁹³⁰⁹ is an apocalyptic number.

It is an amenable number.

989309 is a deficient number, since it is larger than the sum of its proper divisors (1).

989309 is an equidigital number, since it uses as much as digits as its factorization.

989309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 989309 is about 994.6401359286. The cubic root of 989309 is about 99.6423557642.

The spelling of 989309 in words is "nine hundred eighty-nine thousand, three hundred nine".