2118423 has 4 divisors (see below), whose sum is σ = 2824568. Its totient is φ = 1412280.

The previous prime is 2118419. The next prime is 2118433. The reversal of 2118423 is 3248112.

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

It is not a de Polignac number, because 2118423 - 2² = 2118419 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2118423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118433) 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, 353068 + ... + 353073.

It is an arithmetic number, because the mean of its divisors is an integer number (706142).

2^2118423 is an apocalyptic number.

2118423 is a deficient number, since it is larger than the sum of its proper divisors (706145).

2118423 is an equidigital number, since it uses as much as digits as its factorization.

2118423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706144.

The product of its digits is 384, while the sum is 21.

The square root of 2118423 is about 1455.4803330860. The cubic root of 2118423 is about 128.4313046603.

The spelling of 2118423 in words is "two million, one hundred eighteen thousand, four hundred twenty-three".