18209272 has 16 divisors (see below), whose sum is σ = 34446240. Its totient is φ = 9023616.

The previous prime is 18209231. The next prime is 18209309. The reversal of 18209272 is 27290281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9168 + ... + 10975.

It is an arithmetic number, because the mean of its divisors is an integer number (2152890).

Almost surely, 2^18209272 is an apocalyptic number.

It is an amenable number.

18209272 is a deficient number, since it is larger than the sum of its proper divisors (16236968).

18209272 is a wasteful number, since it uses less digits than its factorization.

18209272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262 (or 20258 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18209272 is about 4267.2323583325. The cubic root of 18209272 is about 263.0858726751.

It can be divided in two parts, 18209 and 272, that added together give a palindrome (18481).

The spelling of 18209272 in words is "eighteen million, two hundred nine thousand, two hundred seventy-two".