18227636 has 12 divisors (see below), whose sum is σ = 36455328. Its totient is φ = 7811832.

The previous prime is 18227633. The next prime is 18227641. The reversal of 18227636 is 63672281.

It is a happy number.

18227636 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 18227596 and 18227605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227633) 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, 325466 + ... + 325521.

It is an arithmetic number, because the mean of its divisors is an integer number (3037944).

Almost surely, 2^18227636 is an apocalyptic number.

It is an amenable number.

18227636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18227636 is a wasteful number, since it uses less digits than its factorization.

18227636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650998 (or 650996 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 18227636 is about 4269.3835620614. The cubic root of 18227636 is about 263.1742834172.

The spelling of 18227636 in words is "eighteen million, two hundred twenty-seven thousand, six hundred thirty-six".