18214159 has 4 divisors (see below), whose sum is σ = 18246304. Its totient is φ = 18182016.

The previous prime is 18214111. The next prime is 18214171. The reversal of 18214159 is 95141281.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18214159 - 2¹¹ = 18212111 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 18214159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18214759) 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, 15207 + ... + 16360.

It is an arithmetic number, because the mean of its divisors is an integer number (4561576).

Almost surely, 2^18214159 is an apocalyptic number.

18214159 is a deficient number, since it is larger than the sum of its proper divisors (32145).

18214159 is an equidigital number, since it uses as much as digits as its factorization.

18214159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32144.

The product of its digits is 2880, while the sum is 31.

The square root of 18214159 is about 4267.8049393101. The cubic root of 18214159 is about 263.1094062108.

It can be divided in two parts, 182 and 14159, that added together give a palindrome (14341).

The spelling of 18214159 in words is "eighteen million, two hundred fourteen thousand, one hundred fifty-nine".