9999785 has 4 divisors (see below), whose sum is σ = 11999748. Its totient is φ = 7999824.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999785 is 5879999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5879999 = 59 ⋅99661.

It can be written as a sum of positive squares in 2 ways, for example, as 6205081 + 3794704 = 2491^2 + 1948^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999785 - 2¹⁴ = 9983401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9999785.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 999974 + ... + 999983.

It is an arithmetic number, because the mean of its divisors is an integer number (2999937).

Almost surely, 2^9999785 is an apocalyptic number.

It is an amenable number.

9999785 is a deficient number, since it is larger than the sum of its proper divisors (1999963).

9999785 is a wasteful number, since it uses less digits than its factorization.

9999785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999962.

The product of its digits is 1837080, while the sum is 56.

The square root of 9999785 is about 3162.2436655008. The cubic root of 9999785 is about 215.4419249806.

The spelling of 9999785 in words is "nine million, nine hundred ninety-nine thousand, seven hundred eighty-five".