2171440 has 20 divisors (see below), whose sum is σ = 5048784. Its totient is φ = 868544.

The previous prime is 2171437. The next prime is 2171441. The reversal of 2171440 is 441712.

2171440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2171441) 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, 13492 + ... + 13651.

2^2171440 is an apocalyptic number.

2171440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2171440 is an abundant number, since it is smaller than the sum of its proper divisors (2877344).

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

2171440 is a wasteful number, since it uses less digits than its factorization.

2171440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27156 (or 27150 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 2171440 is about 1473.5806730546. The cubic root of 2171440 is about 129.4938901825.

The spelling of 2171440 in words is "two million, one hundred seventy-one thousand, four hundred forty".