18140216 has 32 divisors (see below), whose sum is σ = 34927200. Its totient is φ = 8830080.

The previous prime is 18140203. The next prime is 18140219. The reversal of 18140216 is 61204181.

It is a junction number, because it is equal to n+sod(n) for n = 18140191 and 18140200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140219) 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, 61766 + ... + 62058.

It is an arithmetic number, because the mean of its divisors is an integer number (1091475).

Almost surely, 2^18140216 is an apocalyptic number.

It is an amenable number.

18140216 is a deficient number, since it is larger than the sum of its proper divisors (16786984).

18140216 is a wasteful number, since it uses less digits than its factorization.

18140216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18140216 is about 4259.1332451568. The cubic root of 18140216 is about 262.7528798168.

Adding to 18140216 its reverse (61204181), we get a palindrome (79344397).

The spelling of 18140216 in words is "eighteen million, one hundred forty thousand, two hundred sixteen".