989909 has 2 divisors, whose sum is σ = 989910. Its totient is φ = 989908.

The previous prime is 989887. The next prime is 989917. The reversal of 989909 is 909989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 485809 = 710^2 + 697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989909 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494954 + 494955.

It is an arithmetic number, because the mean of its divisors is an integer number (494955).

2⁹⁸⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

989909 is a deficient number, since it is larger than the sum of its proper divisors (1).

989909 is an equidigital number, since it uses as much as digits as its factorization.

989909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 989909 is about 994.9417068351. The cubic root of 989909 is about 99.6624955221.

The spelling of 989909 in words is "nine hundred eighty-nine thousand, nine hundred nine".