989666825 has 24 divisors (see below), whose sum is σ = 1404338688. Its totient is φ = 677738880.

The previous prime is 989666803. The next prime is 989666837. The reversal of 989666825 is 528666989.

It is a de Polignac number, because none of the positive numbers 2^k-989666825 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147749 + ... + 154301.

It is an arithmetic number, because the mean of its divisors is an integer number (58514112).

Almost surely, 2^989666825 is an apocalyptic number.

It is an amenable number.

989666825 is a deficient number, since it is larger than the sum of its proper divisors (414671863).

989666825 is a wasteful number, since it uses less digits than its factorization.

989666825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433 (or 7428 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 59.

The square root of 989666825 is about 31458.9705012736. The cubic root of 989666825 is about 996.5436759205.

The spelling of 989666825 in words is "nine hundred eighty-nine million, six hundred sixty-six thousand, eight hundred twenty-five".