18010855 has 4 divisors (see below), whose sum is σ = 21613032. Its totient is φ = 14408680.

The previous prime is 18010829. The next prime is 18010877. The reversal of 18010855 is 55801081.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18010855 - 2¹⁷ = 17879783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1801081 + ... + 1801090.

It is an arithmetic number, because the mean of its divisors is an integer number (5403258).

Almost surely, 2^18010855 is an apocalyptic number.

18010855 is a deficient number, since it is larger than the sum of its proper divisors (3602177).

18010855 is an equidigital number, since it uses as much as digits as its factorization.

18010855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602176.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 18010855 is about 4243.9197683274. The cubic root of 18010855 is about 262.1268105897.

The spelling of 18010855 in words is "eighteen million, ten thousand, eight hundred fifty-five".