9985945 has 4 divisors (see below), whose sum is σ = 11983140. Its totient is φ = 7988752.

The previous prime is 9985909. The next prime is 9985961. The reversal of 9985945 is 5495899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5495899 = 1489 ⋅3691.

It can be written as a sum of positive squares in 2 ways, for example, as 2039184 + 7946761 = 1428^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 9985945 - 2⁹ = 9985433 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998590 + ... + 998599.

It is an arithmetic number, because the mean of its divisors is an integer number (2995785).

Almost surely, 2^9985945 is an apocalyptic number.

It is an amenable number.

9985945 is a deficient number, since it is larger than the sum of its proper divisors (1997195).

9985945 is a wasteful number, since it uses less digits than its factorization.

9985945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997194.

The product of its digits is 583200, while the sum is 49.

The square root of 9985945 is about 3160.0545881361. The cubic root of 9985945 is about 215.3424864128.

The spelling of 9985945 in words is "nine million, nine hundred eighty-five thousand, nine hundred forty-five".