2143645 has 16 divisors (see below), whose sum is σ = 2983680. Its totient is φ = 1448064.

The previous prime is 2143627. The next prime is 2143667. The reversal of 2143645 is 5463412.

2143645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2143645 - 2⁷ = 2143517 is a prime.

2143645 is a lucky 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 15 ways as a sum of consecutive naturals, for example, 2136 + ... + 2974.

It is an arithmetic number, because the mean of its divisors is an integer number (186480).

2^2143645 is an apocalyptic number.

It is an amenable number.

2143645 is a deficient number, since it is larger than the sum of its proper divisors (840035).

2143645 is an equidigital number, since it uses as much as digits as its factorization.

2143645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

The product of its digits is 2880, while the sum is 25.

The square root of 2143645 is about 1464.1191891373. The cubic root of 2143645 is about 128.9389972572.

It can be divided in two parts, 214364 and 5, that added together give a square (214369 = 463²).

The spelling of 2143645 in words is "two million, one hundred forty-three thousand, six hundred forty-five".