3855085812 has 60 divisors (see below), whose sum is σ = 10091276580. Its totient is φ = 1283330304.

The previous prime is 3855085789. The next prime is 3855085813. The reversal of 3855085812 is 2185805583.

3855085812 is a `hidden beast` number, since 3 + 8 + 550 + 85 + 8 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2663179236 + 1191906576 = 51606^2 + 34524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855085813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 250764 + ... + 265692.

It is an arithmetic number, because the mean of its divisors is an integer number (168187943).

Almost surely, 2^3855085812 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 3855085812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5045638290).

3855085812 is an abundant number, since it is smaller than the sum of its proper divisors (6236190768).

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

3855085812 is a wasteful number, since it uses less digits than its factorization.

3855085812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15742 (or 15731 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The square root of 3855085812 is about 62089.3373454734. The cubic root of 3855085812 is about 1567.9950351476.

The spelling of 3855085812 in words is "three billion, eight hundred fifty-five million, eighty-five thousand, eight hundred twelve".