18116443 has 4 divisors (see below), whose sum is σ = 19069960. Its totient is φ = 17162928.

The previous prime is 18116401. The next prime is 18116447. The reversal of 18116443 is 34461181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34461181 = 31 ⋅1111651.

It is a de Polignac number, because none of the positive numbers 2^k-18116443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18116447) 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, 476730 + ... + 476767.

It is an arithmetic number, because the mean of its divisors is an integer number (4767490).

Almost surely, 2^18116443 is an apocalyptic number.

18116443 is a deficient number, since it is larger than the sum of its proper divisors (953517).

18116443 is an equidigital number, since it uses as much as digits as its factorization.

18116443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953516.

The product of its digits is 2304, while the sum is 28.

The square root of 18116443 is about 4256.3415041559. The cubic root of 18116443 is about 262.6380492312.

The spelling of 18116443 in words is "eighteen million, one hundred sixteen thousand, four hundred forty-three".