2117823 has 8 divisors (see below), whose sum is σ = 2830848. Its totient is φ = 1408344.

The previous prime is 2117821. The next prime is 2117833. The reversal of 2117823 is 3287112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2117823 - 2¹ = 2117821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2117793 and 2117802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1240 + ... + 2402.

It is an arithmetic number, because the mean of its divisors is an integer number (353856).

2^2117823 is an apocalyptic number.

2117823 is a deficient number, since it is larger than the sum of its proper divisors (713025).

2117823 is a wasteful number, since it uses less digits than its factorization.

2117823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773.

The product of its digits is 672, while the sum is 24.

The square root of 2117823 is about 1455.2742009670. The cubic root of 2117823 is about 128.4191783350.

The spelling of 2117823 in words is "two million, one hundred seventeen thousand, eight hundred twenty-three".