2171872 has 24 divisors (see below), whose sum is σ = 4343976. Its totient is φ = 1068672.

The previous prime is 2171857. The next prime is 2171881. The reversal of 2171872 is 2781712.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2171872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638 + ... + 2650.

It is an arithmetic number, because the mean of its divisors is an integer number (180999).

2^2171872 is an apocalyptic number.

It is an amenable number.

2171872 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

2171872 is a wasteful number, since it uses less digits than its factorization.

2171872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1082 counting only the distinct ones).

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

The square root of 2171872 is about 1473.7272474919. The cubic root of 2171872 is about 129.5024770574.

The spelling of 2171872 in words is "two million, one hundred seventy-one thousand, eight hundred seventy-two".