2164243 has 4 divisors (see below), whose sum is σ = 2170728. Its totient is φ = 2157760.

The previous prime is 2164229. The next prime is 2164247. The reversal of 2164243 is 3424612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2164243 is a prime.

It is a super-3 number, since 3×2164243³ = 30411603475633370721, which contains 333 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2164243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2164247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (542682).

2^2164243 is an apocalyptic number.

2164243 is a deficient number, since it is larger than the sum of its proper divisors (6485).

2164243 is an equidigital number, since it uses as much as digits as its factorization.

2164243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6484.

The product of its digits is 1152, while the sum is 22.

The square root of 2164243 is about 1471.1366353946. The cubic root of 2164243 is about 129.3506673960.

Adding to 2164243 its reverse (3424612), we get a palindrome (5588855).

The spelling of 2164243 in words is "two million, one hundred sixty-four thousand, two hundred forty-three".