18027841 has 4 divisors (see below), whose sum is σ = 19414612. Its totient is φ = 16641072.

The previous prime is 18027829. The next prime is 18027847. The reversal of 18027841 is 14872081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8386816 + 9641025 = 2896^2 + 3105^2 .

It is a cyclic number.

It is not a de Polignac number, because 18027841 - 2²¹ = 15930689 is a prime.

It is a super-2 number, since 2×18027841² = 650006102242562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18027847) 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, 693366 + ... + 693391.

It is an arithmetic number, because the mean of its divisors is an integer number (4853653).

Almost surely, 2^18027841 is an apocalyptic number.

It is an amenable number.

18027841 is a deficient number, since it is larger than the sum of its proper divisors (1386771).

18027841 is a wasteful number, since it uses less digits than its factorization.

18027841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386770.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18027841 is about 4245.9205126804. The cubic root of 18027841 is about 262.2091884488.

The spelling of 18027841 in words is "eighteen million, twenty-seven thousand, eight hundred forty-one".