18065994 has 64 divisors (see below), whose sum is σ = 40255488. Its totient is φ = 5385600.

The previous prime is 18065981. The next prime is 18066007. The reversal of 18065994 is 49956081.

It is an interprime number because it is at equal distance from previous prime (18065981) and next prime (18066007).

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 175347 + ... + 175449.

It is an arithmetic number, because the mean of its divisors is an integer number (628992).

Almost surely, 2^18065994 is an apocalyptic number.

18065994 is an abundant number, since it is smaller than the sum of its proper divisors (22189494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18065994 is a wasteful number, since it uses less digits than its factorization.

18065994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 18065994 is about 4250.4110389467. The cubic root of 18065994 is about 262.3940325116.

The spelling of 18065994 in words is "eighteen million, sixty-five thousand, nine hundred ninety-four".