9985855 has 16 divisors (see below), whose sum is σ = 13353984. Its totient is φ = 7106080.

The previous prime is 9985853. The next prime is 9985867. The reversal of 9985855 is 5585899.

It is a happy number.

It is not a de Polignac number, because 9985855 - 2¹ = 9985853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9985799 and 9985808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985853) 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, 654 + ... + 4516.

It is an arithmetic number, because the mean of its divisors is an integer number (834624).

Almost surely, 2^9985855 is an apocalyptic number.

9985855 is a deficient number, since it is larger than the sum of its proper divisors (3368129).

9985855 is a wasteful number, since it uses less digits than its factorization.

9985855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926.

The product of its digits is 648000, while the sum is 49.

The square root of 9985855 is about 3160.0403478437. The cubic root of 9985855 is about 215.3418394742.

The spelling of 9985855 in words is "nine million, nine hundred eighty-five thousand, eight hundred fifty-five".