2161404188 has 12 divisors (see below), whose sum is σ = 3838912392. Its totient is φ = 1064572080.

The previous prime is 2161404187. The next prime is 2161404209. The reversal of 2161404188 is 8814041612.

It is a happy number.

It is a congruent 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, 4032203 + ... + 4032738.

It is an arithmetic number, because the mean of its divisors is an integer number (319909366).

Almost surely, 2^2161404188 is an apocalyptic number.

It is an amenable number.

2161404188 is a deficient number, since it is larger than the sum of its proper divisors (1677508204).

2161404188 is a wasteful number, since it uses less digits than its factorization.

2161404188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8065012 (or 8065010 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 2161404188 is about 46490.9043577343. The cubic root of 2161404188 is about 1292.9408673544.

The spelling of 2161404188 in words is "two billion, one hundred sixty-one million, four hundred four thousand, one hundred eighty-eight".