989894909 has 4 divisors (see below), whose sum is σ = 989959104. Its totient is φ = 989830716.

The previous prime is 989894879. The next prime is 989894911. The reversal of 989894909 is 909498989.

989894909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 989894909 - 2²⁰ = 988846333 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989894809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6524 + ... + 44970.

It is an arithmetic number, because the mean of its divisors is an integer number (247489776).

Almost surely, 2^989894909 is an apocalyptic number.

It is an amenable number.

989894909 is a deficient number, since it is larger than the sum of its proper divisors (64195).

989894909 is a wasteful number, since it uses less digits than its factorization.

989894909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64194.

The product of its (nonzero) digits is 15116544, while the sum is 65.

The square root of 989894909 is about 31462.5953951673. The cubic root of 989894909 is about 996.6202263322.

The spelling of 989894909 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, nine hundred nine".