18488216 has 16 divisors (see below), whose sum is σ = 36490200. Its totient is φ = 8757504.

The previous prime is 18488213. The next prime is 18488233. The reversal of 18488216 is 61288481.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a self number, because there is not a number n which added to its sum of digits gives 18488216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18488213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60665 + ... + 60968.

Almost surely, 2^18488216 is an apocalyptic number.

It is an amenable number.

18488216 is a deficient number, since it is larger than the sum of its proper divisors (18001984).

18488216 is a wasteful number, since it uses less digits than its factorization.

18488216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121658 (or 121654 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 18488216 is about 4299.7925531356. The cubic root of 18488216 is about 264.4224564623.

The spelling of 18488216 in words is "eighteen million, four hundred eighty-eight thousand, two hundred sixteen".