985085840 has 20 divisors (see below), whose sum is σ = 2290324764. Its totient is φ = 394034304.

The previous prime is 985085819. The next prime is 985085861. The reversal of 985085840 is 48580589.

It is an interprime number because it is at equal distance from previous prime (985085819) and next prime (985085861).

It can be written as a sum of positive squares in 2 ways, for example, as 113891584 + 871194256 = 10672^2 + 29516^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×985085840² = 1940788224337011200, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 6156707 + ... + 6156866.

Almost surely, 2^985085840 is an apocalyptic number.

It is an amenable number.

985085840 is an abundant number, since it is smaller than the sum of its proper divisors (1305238924).

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

985085840 is a wasteful number, since it uses less digits than its factorization.

985085840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12313586 (or 12313580 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 47.

The square root of 985085840 is about 31386.0771680693. The cubic root of 985085840 is about 995.0036918123.

The spelling of 985085840 in words is "nine hundred eighty-five million, eighty-five thousand, eight hundred forty".