2128185 has 12 divisors (see below), whose sum is σ = 3688932. Its totient is φ = 1135008.

The previous prime is 2128183. The next prime is 2128201. The reversal of 2128185 is 5818212.

It can be written as a sum of positive squares in 2 ways, for example, as 968256 + 1159929 = 984^2 + 1077^2 .

It is not a de Polignac number, because 2128185 - 2¹ = 2128183 is a prime.

2128185 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2128183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23602 + ... + 23691.

It is an arithmetic number, because the mean of its divisors is an integer number (307411).

2^2128185 is an apocalyptic number.

It is an amenable number.

2128185 is a deficient number, since it is larger than the sum of its proper divisors (1560747).

2128185 is a wasteful number, since it uses less digits than its factorization.

2128185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47304 (or 47301 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2128185 is about 1458.8300106592. The cubic root of 2128185 is about 128.6282790915.

Adding to 2128185 its sum of digits (27), we get a palindrome (2128212).

The spelling of 2128185 in words is "two million, one hundred twenty-eight thousand, one hundred eighty-five".