18144073 has 4 divisors (see below), whose sum is σ = 18486468. Its totient is φ = 17801680.

The previous prime is 18144059. The next prime is 18144089. The reversal of 18144073 is 37044181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37044181 = 2683 ⋅13807.

It can be written as a sum of positive squares in 2 ways, for example, as 10259209 + 7884864 = 3203^2 + 2808^2 .

It is a cyclic number.

It is not a de Polignac number, because 18144073 - 2⁹ = 18143561 is a prime.

It is a super-3 number, since 3×18144073³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18144043) 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, 171118 + ... + 171223.

It is an arithmetic number, because the mean of its divisors is an integer number (4621617).

Almost surely, 2^18144073 is an apocalyptic number.

It is an amenable number.

18144073 is a deficient number, since it is larger than the sum of its proper divisors (342395).

18144073 is an equidigital number, since it uses as much as digits as its factorization.

18144073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342394.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18144073 is about 4259.5860127482. The cubic root of 18144073 is about 262.7715008012.

The spelling of 18144073 in words is "eighteen million, one hundred forty-four thousand, seventy-three".