985988821 has 16 divisors (see below), whose sum is σ = 1037470720. Its totient is φ = 935919360.

The previous prime is 985988819. The next prime is 985988827. The reversal of 985988821 is 128889589.

It is a cyclic number.

It is not a de Polignac number, because 985988821 - 2¹ = 985988819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985988827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346621 + ... + 349453.

It is an arithmetic number, because the mean of its divisors is an integer number (64841920).

Almost surely, 2^985988821 is an apocalyptic number.

It is an amenable number.

985988821 is a deficient number, since it is larger than the sum of its proper divisors (51481899).

985988821 is a wasteful number, since it uses less digits than its factorization.

985988821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076.

The product of its digits is 3317760, while the sum is 58.

The square root of 985988821 is about 31400.4589297673. The cubic root of 985988821 is about 995.3076230380.

The spelling of 985988821 in words is "nine hundred eighty-five million, nine hundred eighty-eight thousand, eight hundred twenty-one".