18006394 has 16 divisors (see below), whose sum is σ = 30941568. Its totient is φ = 7698672.

The previous prime is 18006389. The next prime is 18006413. The reversal of 18006394 is 49360081.

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 7 ways as a sum of consecutive naturals, for example, 5764 + ... + 8320.

It is an arithmetic number, because the mean of its divisors is an integer number (1933848).

Almost surely, 2^18006394 is an apocalyptic number.

18006394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18006394 is a deficient number, since it is larger than the sum of its proper divisors (12935174).

18006394 is a wasteful number, since it uses less digits than its factorization.

18006394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18006394 is about 4243.3941603391. The cubic root of 18006394 is about 262.1051672667.

The spelling of 18006394 in words is "eighteen million, six thousand, three hundred ninety-four".