9900855 has 12 divisors (see below), whose sum is σ = 17161560. Its totient is φ = 5280432.

The previous prime is 9900827. The next prime is 9900857. The reversal of 9900855 is 5580099.

It is not a de Polignac number, because 9900855 - 2⁸ = 9900599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900857) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 109965 + ... + 110054.

It is an arithmetic number, because the mean of its divisors is an integer number (1430130).

Almost surely, 2^9900855 is an apocalyptic number.

9900855 is a deficient number, since it is larger than the sum of its proper divisors (7260705).

9900855 is a wasteful number, since it uses less digits than its factorization.

9900855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220030 (or 220027 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 9900855 is about 3146.5624099960. The cubic root of 9900855 is about 214.7290981413.

The spelling of 9900855 in words is "nine million, nine hundred thousand, eight hundred fifty-five".