9989855 has 8 divisors (see below), whose sum is σ = 12280464. Its totient is φ = 7796800.

The previous prime is 9989849. The next prime is 9989879. The reversal of 9989855 is 5589899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9989855 - 2²⁰ = 8941279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9989797 and 9989806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24161 + ... + 24570.

It is an arithmetic number, because the mean of its divisors is an integer number (1535058).

Almost surely, 2^9989855 is an apocalyptic number.

9989855 is a deficient number, since it is larger than the sum of its proper divisors (2290609).

9989855 is a wasteful number, since it uses less digits than its factorization.

9989855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48777.

The product of its digits is 1166400, while the sum is 53.

The square root of 9989855 is about 3160.6731877877. The cubic root of 9989855 is about 215.3705885521.

The spelling of 9989855 in words is "nine million, nine hundred eighty-nine thousand, eight hundred fifty-five".