3855172185 has 16 divisors (see below), whose sum is σ = 6853639680. Its totient is φ = 2056091760.

The previous prime is 3855172157. The next prime is 3855172187. The reversal of 3855172185 is 5812715583.

3855172185 is a `hidden beast` number, since 38 + 5 + 517 + 21 + 85 = 666.

It is not a de Polignac number, because 3855172185 - 2¹² = 3855168089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 3855172185.

It is not an unprimeable number, because it can be changed into a prime (3855172187) 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, 14278281 + ... + 14278550.

It is an arithmetic number, because the mean of its divisors is an integer number (428352480).

Almost surely, 2^3855172185 is an apocalyptic number.

It is an amenable number.

3855172185 is a deficient number, since it is larger than the sum of its proper divisors (2998467495).

3855172185 is a wasteful number, since it uses less digits than its factorization.

3855172185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28556845 (or 28556839 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 3855172185 is about 62090.0328957877. The cubic root of 3855172185 is about 1568.0067453429.

The spelling of 3855172185 in words is "three billion, eight hundred fifty-five million, one hundred seventy-two thousand, one hundred eighty-five".