18722214 has 36 divisors (see below), whose sum is σ = 47189844. Its totient is φ = 5348952.

The previous prime is 18722191. The next prime is 18722267. The reversal of 18722214 is 41222781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9732 + ... + 11495.

It is an arithmetic number, because the mean of its divisors is an integer number (1310829).

Almost surely, 2^18722214 is an apocalyptic number.

18722214 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18722214 is an abundant number, since it is smaller than the sum of its proper divisors (28467630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18722214 is a wasteful number, since it uses less digits than its factorization.

18722214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21249 (or 21239 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 18722214 is about 4326.9173784578. The cubic root of 18722214 is about 265.5333461686.

Adding to 18722214 its reverse (41222781), we get a palindrome (59944995).

The spelling of 18722214 in words is "eighteen million, seven hundred twenty-two thousand, two hundred fourteen".