8771985 has 12 divisors (see below), whose sum is σ = 15204852. Its totient is φ = 4678368.

The previous prime is 8771981. The next prime is 8772011. The reversal of 8771985 is 5891778.

It can be written as a sum of positive squares in 2 ways, for example, as 1498176 + 7273809 = 1224^2 + 2697^2 .

It is not a de Polignac number, because 8771985 - 2² = 8771981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 194933 = 8771985 / (8 + 7 + 7 + 1 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 8771985.

It is not an unprimeable number, because it can be changed into a prime (8771981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97422 + ... + 97511.

It is an arithmetic number, because the mean of its divisors is an integer number (1267071).

Almost surely, 2^8771985 is an apocalyptic number.

It is an amenable number.

8771985 is a deficient number, since it is larger than the sum of its proper divisors (6432867).

8771985 is a wasteful number, since it uses less digits than its factorization.

8771985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194944 (or 194941 counting only the distinct ones).

The product of its digits is 141120, while the sum is 45.

The square root of 8771985 is about 2961.7537034669. The cubic root of 8771985 is about 206.2367043771.

The spelling of 8771985 in words is "eight million, seven hundred seventy-one thousand, nine hundred eighty-five".