18016841 has 4 divisors (see below), whose sum is σ = 18034884. Its totient is φ = 17998800.

The previous prime is 18016837. The next prime is 18016853. The reversal of 18016841 is 14861081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14861081 = 71 ⋅209311.

It can be written as a sum of positive squares in 2 ways, for example, as 15523600 + 2493241 = 3940^2 + 1579^2 .

It is a cyclic number.

It is not a de Polignac number, because 18016841 - 2² = 18016837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18016861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7430 + ... + 9551.

It is an arithmetic number, because the mean of its divisors is an integer number (4508721).

Almost surely, 2^18016841 is an apocalyptic number.

It is an amenable number.

18016841 is a deficient number, since it is larger than the sum of its proper divisors (18043).

18016841 is a wasteful number, since it uses less digits than its factorization.

18016841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18042.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18016841 is about 4244.6249539859. The cubic root of 18016841 is about 262.1558471029.

The spelling of 18016841 in words is "eighteen million, sixteen thousand, eight hundred forty-one".