9975866 has 16 divisors (see below), whose sum is σ = 15517224. Its totient is φ = 4806144.

The previous prime is 9975863. The next prime is 9975899. The reversal of 9975866 is 6685799.

It can be written as a sum of positive squares in 4 ways, for example, as 7812025 + 2163841 = 2795^2 + 1471^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9975863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7766 + ... + 8958.

Almost surely, 2^9975866 is an apocalyptic number.

9975866 is a deficient number, since it is larger than the sum of its proper divisors (5541358).

9975866 is a wasteful number, since it uses less digits than its factorization.

9975866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345.

The product of its digits is 816480, while the sum is 50.

The square root of 9975866 is about 3158.4594345978. The cubic root of 9975866 is about 215.2700122988.

The spelling of 9975866 in words is "nine million, nine hundred seventy-five thousand, eight hundred sixty-six".