989393609 has 6 divisors (see below), whose sum is σ = 1024687950. Its totient is φ = 955275776.

The previous prime is 989393549. The next prime is 989393633. The reversal of 989393609 is 906393989.

It can be written as a sum of positive squares in 3 ways, for example, as 3433609 + 985960000 = 1853^2 + 31400^2 .

It is a de Polignac number, because none of the positive numbers 2^k-989393609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (989393809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587384 + ... + 589065.

It is an arithmetic number, because the mean of its divisors is an integer number (170781325).

Almost surely, 2^989393609 is an apocalyptic number.

It is an amenable number.

989393609 is a deficient number, since it is larger than the sum of its proper divisors (35294341).

989393609 is a wasteful number, since it uses less digits than its factorization.

989393609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176507 (or 1176478 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 56.

The square root of 989393609 is about 31454.6277835234. The cubic root of 989393609 is about 996.4519626526.

The spelling of 989393609 in words is "nine hundred eighty-nine million, three hundred ninety-three thousand, six hundred nine".