18364855 has 4 divisors (see below), whose sum is σ = 22037832. Its totient is φ = 14691880.

The previous prime is 18364831. The next prime is 18364891. The reversal of 18364855 is 55846381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55846381 = 1877 ⋅29753.

It is not a de Polignac number, because 18364855 - 2⁹ = 18364343 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 1836481 + ... + 1836490.

It is an arithmetic number, because the mean of its divisors is an integer number (5509458).

Almost surely, 2^18364855 is an apocalyptic number.

18364855 is a deficient number, since it is larger than the sum of its proper divisors (3672977).

18364855 is an equidigital number, since it uses as much as digits as its factorization.

18364855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672976.

The product of its digits is 115200, while the sum is 40.

The square root of 18364855 is about 4285.4235496623. The cubic root of 18364855 is about 263.8330316658.

The spelling of 18364855 in words is "eighteen million, three hundred sixty-four thousand, eight hundred fifty-five".