2821243 has 4 divisors (see below), whose sum is σ = 2874528. Its totient is φ = 2767960.

The previous prime is 2821229. The next prime is 2821267. The reversal of 2821243 is 3421282.

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-2821243 is a prime.

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.

It is not an unprimeable number, because it can be changed into a prime (2821543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26563 + ... + 26668.

It is an arithmetic number, because the mean of its divisors is an integer number (718632).

2^2821243 is an apocalyptic number.

2821243 is a deficient number, since it is larger than the sum of its proper divisors (53285).

2821243 is an equidigital number, since it uses as much as digits as its factorization.

2821243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53284.

The product of its digits is 768, while the sum is 22.

The square root of 2821243 is about 1679.6556194649. The cubic root of 2821243 is about 141.3015193067.

The spelling of 2821243 in words is "two million, eight hundred twenty-one thousand, two hundred forty-three".