2171790 has 48 divisors (see below), whose sum is σ = 5756400. Its totient is φ = 567936.

The previous prime is 2171777. The next prime is 2171831. The reversal of 2171790 is 971712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5106 + ... + 5514.

It is an arithmetic number, because the mean of its divisors is an integer number (119925).

2^2171790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2878200).

2171790 is an abundant number, since it is smaller than the sum of its proper divisors (3584610).

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

2171790 is a wasteful number, since it uses less digits than its factorization.

2171790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 2171790 is about 1473.6994266132. The cubic root of 2171790 is about 129.5008472289.

The spelling of 2171790 in words is "two million, one hundred seventy-one thousand, seven hundred ninety".