985944990 has 32 divisors (see below), whose sum is σ = 2376708480. Its totient is φ = 261758624.

The previous prime is 985944961. The next prime is 985944997. The reversal of 985944990 is 99449589.

It is a super-2 number, since 2×985944990² = 1944175046612200200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 985944990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985944997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65580 + ... + 79199.

It is an arithmetic number, because the mean of its divisors is an integer number (74272140).

Almost surely, 2^985944990 is an apocalyptic number.

985944990 is an abundant number, since it is smaller than the sum of its proper divisors (1390763490).

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

985944990 is a wasteful number, since it uses less digits than its factorization.

985944990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145016.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 985944990 is about 31399.7609863515. The cubic root of 985944990 is about 995.2928744006.

The spelling of 985944990 in words is "nine hundred eighty-five million, nine hundred forty-four thousand, nine hundred ninety".