2217823 has 4 divisors (see below), whose sum is σ = 2238280. Its totient is φ = 2197368.

The previous prime is 2217799. The next prime is 2217829. The reversal of 2217823 is 3287122.

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

It is a cyclic number.

It is not a de Polignac number, because 2217823 - 2¹³ = 2209631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217829) 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, 10065 + ... + 10282.

It is an arithmetic number, because the mean of its divisors is an integer number (559570).

2^2217823 is an apocalyptic number.

2217823 is a deficient number, since it is larger than the sum of its proper divisors (20457).

2217823 is a wasteful number, since it uses less digits than its factorization.

2217823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20456.

The product of its digits is 1344, while the sum is 25.

The square root of 2217823 is about 1489.2357100204. The cubic root of 2217823 is about 130.4094192890.

It can be divided in two parts, 22178 and 23, that added together give a square (22201 = 149²).

The spelling of 2217823 in words is "two million, two hundred seventeen thousand, eight hundred twenty-three".