18028441 has 4 divisors (see below), whose sum is σ = 18037300. Its totient is φ = 18019584.

The previous prime is 18028433. The next prime is 18028447. The reversal of 18028441 is 14482081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16232841 + 1795600 = 4029^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 18028441 - 2³ = 18028433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18028447) 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, 325 + ... + 6013.

It is an arithmetic number, because the mean of its divisors is an integer number (4509325).

Almost surely, 2^18028441 is an apocalyptic number.

It is an amenable number.

18028441 is a deficient number, since it is larger than the sum of its proper divisors (8859).

18028441 is an equidigital number, since it uses as much as digits as its factorization.

18028441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8858.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 18028441 is about 4245.9911681491. The cubic root of 18028441 is about 262.2120973526.

The spelling of 18028441 in words is "eighteen million, twenty-eight thousand, four hundred forty-one".