18005356 has 24 divisors (see below), whose sum is σ = 32168304. Its totient is φ = 8816640.

The previous prime is 18005353. The next prime is 18005357. The reversal of 18005356 is 65350081.

It is not an unprimeable number, because it can be changed into a prime (18005353) 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 7 ways as a sum of consecutive naturals, for example, 63936 + ... + 64216.

It is an arithmetic number, because the mean of its divisors is an integer number (1340346).

Almost surely, 2^18005356 is an apocalyptic number.

It is an amenable number.

18005356 is a deficient number, since it is larger than the sum of its proper divisors (14162948).

18005356 is a wasteful number, since it uses less digits than its factorization.

18005356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 18005356 is about 4243.2718508245. The cubic root of 18005356 is about 262.1001307152.

The spelling of 18005356 in words is "eighteen million, five thousand, three hundred fifty-six".