18143923 has 8 divisors (see below), whose sum is σ = 20782080. Its totient is φ = 15517320.

The previous prime is 18143921. The next prime is 18143929. The reversal of 18143923 is 32934181.

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

It is not a de Polignac number, because 18143923 - 2¹ = 18143921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18143921) 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 7 ways as a sum of consecutive naturals, for example, 798 + ... + 6076.

It is an arithmetic number, because the mean of its divisors is an integer number (2597760).

Almost surely, 2^18143923 is an apocalyptic number.

18143923 is a deficient number, since it is larger than the sum of its proper divisors (2638157).

18143923 is an equidigital number, since it uses as much as digits as its factorization.

18143923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5777.

The product of its digits is 5184, while the sum is 31.

The square root of 18143923 is about 4259.5684053669. The cubic root of 18143923 is about 262.7707766743.

The spelling of 18143923 in words is "eighteen million, one hundred forty-three thousand, nine hundred twenty-three".