989509 has 8 divisors (see below), whose sum is σ = 1035000. Its totient is φ = 944832.

The previous prime is 989507. The next prime is 989533. The reversal of 989509 is 905989.

989509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 184900 + 804609 = 430^2 + 897^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 989509 - 2¹ = 989507 is a prime.

It is a super-2 number, since 2×989509² = 1958256122162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4207 + ... + 4435.

It is an arithmetic number, because the mean of its divisors is an integer number (129375).

2⁹⁸⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

989509 is a deficient number, since it is larger than the sum of its proper divisors (45491).

989509 is a wasteful number, since it uses less digits than its factorization.

989509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 989509 is about 994.7406697225. The cubic root of 989509 is about 99.6490699214.

The spelling of 989509 in words is "nine hundred eighty-nine thousand, five hundred nine".