2187172 has 12 divisors (see below), whose sum is σ = 4122076. Its totient is φ = 1009440.

The previous prime is 2187161. The next prime is 2187193. The reversal of 2187172 is 2717812.

2187172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1454436 + 732736 = 1206^2 + 856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2187172.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20979 + ... + 21082.

2^2187172 is an apocalyptic number.

It is an amenable number.

2187172 is a deficient number, since it is larger than the sum of its proper divisors (1934904).

2187172 is a wasteful number, since it uses less digits than its factorization.

2187172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42078 (or 42076 counting only the distinct ones).

The product of its digits is 1568, while the sum is 28.

The square root of 2187172 is about 1478.9090573798. The cubic root of 2187172 is about 129.8058640770.

The spelling of 2187172 in words is "two million, one hundred eighty-seven thousand, one hundred seventy-two".