18208716 has 12 divisors (see below), whose sum is σ = 42487032. Its totient is φ = 6069568.

The previous prime is 18208711. The next prime is 18208727. The reversal of 18208716 is 61780281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18208711) 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, 758685 + ... + 758708.

It is an arithmetic number, because the mean of its divisors is an integer number (3540586).

Almost surely, 2^18208716 is an apocalyptic number.

It is an amenable number.

18208716 is an abundant number, since it is smaller than the sum of its proper divisors (24278316).

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

18208716 is a wasteful number, since it uses less digits than its factorization.

18208716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517400 (or 1517398 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 18208716 is about 4267.1672102227. The cubic root of 18208716 is about 263.0831949690.

Adding to 18208716 its reverse (61780281), we get a palindrome (79988997).

The spelling of 18208716 in words is "eighteen million, two hundred eight thousand, seven hundred sixteen".