18072306 has 48 divisors (see below), whose sum is σ = 47112000. Its totient is φ = 4891104.

The previous prime is 18072293. The next prime is 18072323. The reversal of 18072306 is 60327081.

It is a self number, because there is not a number n which added to its sum of digits gives 18072306.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1381 + ... + 6168.

It is an arithmetic number, because the mean of its divisors is an integer number (981500).

Almost surely, 2^18072306 is an apocalyptic number.

18072306 is an abundant number, since it is smaller than the sum of its proper divisors (29039694).

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

18072306 is a wasteful number, since it uses less digits than its factorization.

18072306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7583 (or 7580 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18072306 is about 4251.1534905247. The cubic root of 18072306 is about 262.4245878612.

Adding to 18072306 its reverse (60327081), we get a palindrome (78399387).

The spelling of 18072306 in words is "eighteen million, seventy-two thousand, three hundred six".