989817656 has 16 divisors (see below), whose sum is σ = 1965079440. Its totient is φ = 465796480.

The previous prime is 989817643. The next prime is 989817667. The reversal of 989817656 is 656718989.

It is a junction number, because it is equal to n+sod(n) for n = 989817595 and 989817604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3638900 + ... + 3639171.

It is an arithmetic number, because the mean of its divisors is an integer number (122817465).

Almost surely, 2^989817656 is an apocalyptic number.

It is an amenable number.

989817656 is a deficient number, since it is larger than the sum of its proper divisors (975261784).

989817656 is a wasteful number, since it uses less digits than its factorization.

989817656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278094 (or 7278090 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 59.

The square root of 989817656 is about 31461.3676752935. The cubic root of 989817656 is about 996.5942997062.

The spelling of 989817656 in words is "nine hundred eighty-nine million, eight hundred seventeen thousand, six hundred fifty-six".