18065849 has 4 divisors (see below), whose sum is σ = 19128564. Its totient is φ = 17003136.

The previous prime is 18065837. The next prime is 18065857. The reversal of 18065849 is 94856081.

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 15366400 + 2699449 = 3920^2 + 1643^2 .

It is a cyclic number.

It is not a de Polignac number, because 18065849 - 2¹² = 18061753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18065809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531332 + ... + 531365.

It is an arithmetic number, because the mean of its divisors is an integer number (4782141).

Almost surely, 2^18065849 is an apocalyptic number.

It is an amenable number.

18065849 is a deficient number, since it is larger than the sum of its proper divisors (1062715).

18065849 is a wasteful number, since it uses less digits than its factorization.

18065849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062714.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 18065849 is about 4250.3939817386. The cubic root of 18065849 is about 262.3933305070.

The spelling of 18065849 in words is "eighteen million, sixty-five thousand, eight hundred forty-nine".