2157188 has 18 divisors (see below), whose sum is σ = 4150398. Its totient is φ = 980320.

The previous prime is 2157187. The next prime is 2157209. The reversal of 2157188 is 8817512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1982464 + 174724 = 1408^2 + 418^2 .

It is not an unprimeable number, because it can be changed into a prime (2157187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1745 + ... + 2712.

2^2157188 is an apocalyptic number.

It is an amenable number.

2157188 is a deficient number, since it is larger than the sum of its proper divisors (1993210).

2157188 is a wasteful number, since it uses less digits than its factorization.

2157188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483 (or 4470 counting only the distinct ones).

The product of its digits is 4480, while the sum is 32.

The square root of 2157188 is about 1468.7368722818. The cubic root of 2157188 is about 129.2099619460.

The spelling of 2157188 in words is "two million, one hundred fifty-seven thousand, one hundred eighty-eight".