18522237 has 8 divisors (see below), whose sum is σ = 25363936. Its totient is φ = 12014352.

The previous prime is 18522233. The next prime is 18522239. The reversal of 18522237 is 73222581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18522237 - 2² = 18522233 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18522233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83323 + ... + 83544.

It is an arithmetic number, because the mean of its divisors is an integer number (3170492).

Almost surely, 2^18522237 is an apocalyptic number.

It is an amenable number.

18522237 is a deficient number, since it is larger than the sum of its proper divisors (6841699).

18522237 is a wasteful number, since it uses less digits than its factorization.

18522237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166907.

The product of its digits is 6720, while the sum is 30.

The square root of 18522237 is about 4303.7468559384. The cubic root of 18522237 is about 264.5845489738.

It can be divided in two parts, 185 and 22237, that added together give a palindrome (22422).

The spelling of 18522237 in words is "eighteen million, five hundred twenty-two thousand, two hundred thirty-seven".