2171823 has 16 divisors (see below), whose sum is σ = 3012096. Its totient is φ = 1391040.

The previous prime is 2171777. The next prime is 2171831. The reversal of 2171823 is 3281712.

2171823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2171823 - 2⁶ = 2171759 is a prime.

2171823 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2171793 and 2171802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171843) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10188 + ... + 10398.

It is an arithmetic number, because the mean of its divisors is an integer number (188256).

2^2171823 is an apocalyptic number.

2171823 is a deficient number, since it is larger than the sum of its proper divisors (840273).

2171823 is a wasteful number, since it uses less digits than its factorization.

2171823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334.

The product of its digits is 672, while the sum is 24.

The square root of 2171823 is about 1473.7106228836. The cubic root of 2171823 is about 129.5015031404.

The spelling of 2171823 in words is "two million, one hundred seventy-one thousand, eight hundred twenty-three".