2171456 has 56 divisors (see below), whose sum is σ = 5096256. Its totient is φ = 898560.

The previous prime is 2171441. The next prime is 2171497. The reversal of 2171456 is 6541712.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16511 + ... + 16641.

2^2171456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2548128).

2171456 is an abundant number, since it is smaller than the sum of its proper divisors (2924800).

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

2171456 is a wasteful number, since it uses less digits than its factorization.

2171456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 177 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 2171456 is about 1473.5861019974. The cubic root of 2171456 is about 129.4942082352.

The spelling of 2171456 in words is "two million, one hundred seventy-one thousand, four hundred fifty-six".