9857985 has 16 divisors (see below), whose sum is σ = 15833664. Its totient is φ = 5237312.

The previous prime is 9857983. The next prime is 9858041. The reversal of 9857985 is 5897589.

9857985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9857985 - 2¹ = 9857983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9857983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3274 + ... + 5516.

It is an arithmetic number, because the mean of its divisors is an integer number (989604).

Almost surely, 2^9857985 is an apocalyptic number.

It is an amenable number.

9857985 is a deficient number, since it is larger than the sum of its proper divisors (5975679).

9857985 is a wasteful number, since it uses less digits than its factorization.

9857985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544.

The product of its digits is 907200, while the sum is 51.

The square root of 9857985 is about 3139.7428238631. The cubic root of 9857985 is about 214.4187291618.

The spelling of 9857985 in words is "nine million, eight hundred fifty-seven thousand, nine hundred eighty-five".