855860985 has 80 divisors (see below), whose sum is σ = 1845782400. Its totient is φ = 370635264.

The previous prime is 855860939. The next prime is 855860987. The reversal of 855860985 is 589068558.

855860985 is a `hidden beast` number, since 8 + 558 + 6 + 0 + 9 + 85 = 666.

It is not a de Polignac number, because 855860985 - 2⁶ = 855860921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855860987) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 45921 + ... + 61809.

It is an arithmetic number, because the mean of its divisors is an integer number (23072280).

Almost surely, 2^855860985 is an apocalyptic number.

It is an amenable number.

855860985 is an abundant number, since it is smaller than the sum of its proper divisors (989921415).

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

855860985 is a wasteful number, since it uses less digits than its factorization.

855860985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15932 (or 15923 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 54.

The square root of 855860985 is about 29255.1018627521. The cubic root of 855860985 is about 949.4404775397.

The spelling of 855860985 in words is "eight hundred fifty-five million, eight hundred sixty thousand, nine hundred eighty-five".