989039809 has 8 divisors (see below), whose sum is σ = 1023840000. Its totient is φ = 954286032.

The previous prime is 989039771. The next prime is 989039819. The reversal of 989039809 is 908930989.

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 989039809 - 2¹⁷ = 988908737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989039809.

It is not an unprimeable number, because it can be changed into a prime (989039819) 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, 34992 + ... + 56590.

It is an arithmetic number, because the mean of its divisors is an integer number (127980000).

Almost surely, 2^989039809 is an apocalyptic number.

It is an amenable number.

989039809 is a deficient number, since it is larger than the sum of its proper divisors (34800191).

989039809 is a wasteful number, since it uses less digits than its factorization.

989039809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23207.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 989039809 is about 31449.0033069412. The cubic root of 989039809 is about 996.3331738200. Note that the first 3 decimals are identical.

The spelling of 989039809 in words is "nine hundred eighty-nine million, thirty-nine thousand, eight hundred nine".