18143973 has 8 divisors (see below), whose sum is σ = 26880000. Its totient is φ = 12095964.

The previous prime is 18143971. The next prime is 18143989. The reversal of 18143973 is 37934181.

It is a happy number.

It is not a de Polignac number, because 18143973 - 2¹ = 18143971 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18143971) 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, 335973 + ... + 336026.

It is an arithmetic number, because the mean of its divisors is an integer number (3360000).

Almost surely, 2^18143973 is an apocalyptic number.

It is an amenable number.

18143973 is a deficient number, since it is larger than the sum of its proper divisors (8736027).

18143973 is an equidigital number, since it uses as much as digits as its factorization.

18143973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672008 (or 672002 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18143973 is about 4259.5742745021. The cubic root of 18143973 is about 262.7710180504.

The spelling of 18143973 in words is "eighteen million, one hundred forty-three thousand, nine hundred seventy-three".