2173823 has 4 divisors (see below), whose sum is σ = 2195448. Its totient is φ = 2152200.

The previous prime is 2173819. The next prime is 2173877. The reversal of 2173823 is 3283712.

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 2173823 - 2² = 2173819 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 2173792 and 2173801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10661 + ... + 10862.

It is an arithmetic number, because the mean of its divisors is an integer number (548862).

2^2173823 is an apocalyptic number.

2173823 is a deficient number, since it is larger than the sum of its proper divisors (21625).

2173823 is a wasteful number, since it uses less digits than its factorization.

2173823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21624.

The product of its digits is 2016, while the sum is 26.

The square root of 2173823 is about 1474.3890260037. The cubic root of 2173823 is about 129.5412429570.

The spelling of 2173823 in words is "two million, one hundred seventy-three thousand, eight hundred twenty-three".