855813900 has 144 divisors (see below), whose sum is σ = 2667829248. Its totient is φ = 211200000.

The previous prime is 855813839. The next prime is 855813947. The reversal of 855813900 is 9318558.

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 47 ways as a sum of consecutive naturals, for example, 211900 + ... + 215900.

It is an arithmetic number, because the mean of its divisors is an integer number (18526592).

Almost surely, 2^855813900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855813900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333914624).

855813900 is an abundant number, since it is smaller than the sum of its proper divisors (1812015348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855813900 is a wasteful number, since it uses less digits than its factorization.

855813900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072 (or 4065 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 855813900 is about 29254.2971202523. The cubic root of 855813900 is about 949.4230661355.

The spelling of 855813900 in words is "eight hundred fifty-five million, eight hundred thirteen thousand, nine hundred".