2143805 has 8 divisors (see below), whose sum is σ = 2655744. Its totient is φ = 1659600.

The previous prime is 2143793. The next prime is 2143829. The reversal of 2143805 is 5083412.

2143805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2143805 - 2⁶ = 2143741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6761 + ... + 7070.

It is an arithmetic number, because the mean of its divisors is an integer number (331968).

2^2143805 is an apocalyptic number.

It is an amenable number.

2143805 is a deficient number, since it is larger than the sum of its proper divisors (511939).

2143805 is a wasteful number, since it uses less digits than its factorization.

2143805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13867.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2143805 is about 1464.1738284780. The cubic root of 2143805 is about 128.9422051463.

The spelling of 2143805 in words is "two million, one hundred forty-three thousand, eight hundred five".