989894945 has 32 divisors (see below), whose sum is σ = 1332925440. Its totient is φ = 700773120.

The previous prime is 989894911. The next prime is 989894947. The reversal of 989894945 is 549498989.

It is not a de Polignac number, because 989894945 - 2¹⁶ = 989829409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (989894947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217382 + ... + 221888.

It is an arithmetic number, because the mean of its divisors is an integer number (41653920).

Almost surely, 2^989894945 is an apocalyptic number.

It is an amenable number.

989894945 is a deficient number, since it is larger than the sum of its proper divisors (343030495).

989894945 is a wasteful number, since it uses less digits than its factorization.

989894945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665.

The product of its digits is 33592320, while the sum is 65.

The square root of 989894945 is about 31462.5959672752. The cubic root of 989894945 is about 996.6202384137.

The spelling of 989894945 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, nine hundred forty-five".