18367216 has 20 divisors (see below), whose sum is σ = 40670512. Its totient is φ = 7871616.

The previous prime is 18367211. The next prime is 18367267. The reversal of 18367216 is 61276381.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18367211) 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, 81885 + ... + 82108.

Almost surely, 2^18367216 is an apocalyptic number.

18367216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18367216 is an abundant number, since it is smaller than the sum of its proper divisors (22303296).

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

18367216 is a wasteful number, since it uses less digits than its factorization.

18367216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164008 (or 164002 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 18367216 is about 4285.6990094966. The cubic root of 18367216 is about 263.8443373744.

The spelling of 18367216 in words is "eighteen million, three hundred sixty-seven thousand, two hundred sixteen".