985705812 has 144 divisors (see below), whose sum is σ = 3084506880. Its totient is φ = 258453504.

The previous prime is 985705793. The next prime is 985705829. The reversal of 985705812 is 218507589.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 631489 + ... + 633047.

Almost surely, 2^985705812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 985705812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1542253440).

985705812 is an abundant number, since it is smaller than the sum of its proper divisors (2098801068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

985705812 is a wasteful number, since it uses less digits than its factorization.

985705812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 985705812 is about 31395.9521594743. The cubic root of 985705812 is about 995.2123859982.

The spelling of 985705812 in words is "nine hundred eighty-five million, seven hundred five thousand, eight hundred twelve".