18163423 has 4 divisors (see below), whose sum is σ = 18257728. Its totient is φ = 18069120.

The previous prime is 18163403. The next prime is 18163441. The reversal of 18163423 is 32436181.

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 18163423 - 2¹³ = 18155231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18163391 and 18163400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163403) 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, 46863 + ... + 47248.

It is an arithmetic number, because the mean of its divisors is an integer number (4564432).

Almost surely, 2^18163423 is an apocalyptic number.

18163423 is a deficient number, since it is larger than the sum of its proper divisors (94305).

18163423 is an equidigital number, since it uses as much as digits as its factorization.

18163423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94304.

The product of its digits is 3456, while the sum is 28.

The square root of 18163423 is about 4261.8567549837. The cubic root of 18163423 is about 262.8648797260.

The spelling of 18163423 in words is "eighteen million, one hundred sixty-three thousand, four hundred twenty-three".