2185384869 has 12 divisors (see below), whose sum is σ = 3160579500. Its totient is φ = 1455117504.

The previous prime is 2185384849. The next prime is 2185384889. The reversal of 2185384869 is 9684835812.

2185384869 is a `hidden beast` number, since 2 + 1 + 8 + 538 + 48 + 69 = 666.

It is an interprime number because it is at equal distance from previous prime (2185384849) and next prime (2185384889).

It can be written as a sum of positive squares in 2 ways, for example, as 1863648900 + 321735969 = 43170^2 + 17937^2 .

It is not a de Polignac number, because 2185384869 - 2¹¹ = 2185382821 is a prime.

It is a super-2 number, since 2×2185384869² = 9551814051308294322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185384849) 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, 142794 + ... + 157355.

It is an arithmetic number, because the mean of its divisors is an integer number (263381625).

Almost surely, 2^2185384869 is an apocalyptic number.

It is an amenable number.

2185384869 is a deficient number, since it is larger than the sum of its proper divisors (975194631).

2185384869 is a wasteful number, since it uses less digits than its factorization.

2185384869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300964 (or 300961 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 2185384869 is about 46748.1001646056. The cubic root of 2185384869 is about 1297.7049979593.

The spelling of 2185384869 in words is "two billion, one hundred eighty-five million, three hundred eighty-four thousand, eight hundred sixty-nine".