2161404186 has 8 divisors (see below), whose sum is σ = 4322808384. Its totient is φ = 720468060.

The previous prime is 2161404163. The next prime is 2161404187. The reversal of 2161404186 is 6814041612.

It is a sphenic number, since it is the product of 3 distinct primes.

2161404186 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2161404187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180117010 + ... + 180117021.

It is an arithmetic number, because the mean of its divisors is an integer number (540351048).

Almost surely, 2^2161404186 is an apocalyptic number.

2161404186 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2161404186 is a wasteful number, since it uses less digits than its factorization.

2161404186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360234036.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 2161404186 is about 46490.9043362247. The cubic root of 2161404186 is about 1292.9408669556.

Adding to 2161404186 its reverse (6814041612), we get a palindrome (8975445798).

The spelling of 2161404186 in words is "two billion, one hundred sixty-one million, four hundred four thousand, one hundred eighty-six".