988909 has 2 divisors, whose sum is σ = 988910. Its totient is φ = 988908.

The previous prime is 988901. The next prime is 988937. The reversal of 988909 is 909889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562500 + 426409 = 750^2 + 653^2 .

It is an emirp because it is prime and its reverse (909889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 988909 - 2³ = 988901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988901) 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, 494454 + 494455.

It is an arithmetic number, because the mean of its divisors is an integer number (494455).

2⁹⁸⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

988909 is a deficient number, since it is larger than the sum of its proper divisors (1).

988909 is an equidigital number, since it uses as much as digits as its factorization.

988909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 988909 is about 994.4390378500. The cubic root of 988909 is about 99.6289247347.

The spelling of 988909 in words is "nine hundred eighty-eight thousand, nine hundred nine".