18214855 has 4 divisors (see below), whose sum is σ = 21857832. Its totient is φ = 14571880.

The previous prime is 18214853. The next prime is 18214877. The reversal of 18214855 is 55841281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55841281 = 983 ⋅56807.

It is not a de Polignac number, because 18214855 - 2¹ = 18214853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18214855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18214853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1821481 + ... + 1821490.

It is an arithmetic number, because the mean of its divisors is an integer number (5464458).

Almost surely, 2^18214855 is an apocalyptic number.

18214855 is a deficient number, since it is larger than the sum of its proper divisors (3642977).

18214855 is an equidigital number, since it uses as much as digits as its factorization.

18214855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642976.

The product of its digits is 12800, while the sum is 34.

The square root of 18214855 is about 4267.8864792775. The cubic root of 18214855 is about 263.1127574830.

The spelling of 18214855 in words is "eighteen million, two hundred fourteen thousand, eight hundred fifty-five".