18018214 has 4 divisors (see below), whose sum is σ = 27027324. Its totient is φ = 9009106.

The previous prime is 18018191. The next prime is 18018233. The reversal of 18018214 is 41281081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41281081 = 3449 ⋅11969.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4504552 + ... + 4504555.

It is an arithmetic number, because the mean of its divisors is an integer number (6756831).

Almost surely, 2^18018214 is an apocalyptic number.

18018214 is a deficient number, since it is larger than the sum of its proper divisors (9009110).

18018214 is an equidigital number, since it uses as much as digits as its factorization.

18018214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009109.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 18018214 is about 4244.7866848642. The cubic root of 18018214 is about 262.1625062584.

Adding to 18018214 its reverse (41281081), we get a palindrome (59299295).

The spelling of 18018214 in words is "eighteen million, eighteen thousand, two hundred fourteen".