18456216 has 32 divisors (see below), whose sum is σ = 46578240. Its totient is φ = 6093728.

The previous prime is 18456211. The next prime is 18456223. The reversal of 18456216 is 61265481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18456211) 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, 1026 + ... + 6161.

It is an arithmetic number, because the mean of its divisors is an integer number (1455570).

Almost surely, 2^18456216 is an apocalyptic number.

It is an amenable number.

18456216 is an abundant number, since it is smaller than the sum of its proper divisors (28122024).

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

18456216 is a wasteful number, since it uses less digits than its factorization.

18456216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7303 (or 7299 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 18456216 is about 4296.0698318347. The cubic root of 18456216 is about 264.2698113913.

The spelling of 18456216 in words is "eighteen million, four hundred fifty-six thousand, two hundred sixteen".