18145216 has 14 divisors (see below), whose sum is σ = 36007040. Its totient is φ = 9072576.

The previous prime is 18145181. The next prime is 18145219. The reversal of 18145216 is 61254181.

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 (18145219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 141696 + ... + 141823.

Almost surely, 2^18145216 is an apocalyptic number.

18145216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18145216 is a deficient number, since it is larger than the sum of its proper divisors (17861824).

18145216 is an equidigital number, since it uses as much as digits as its factorization.

18145216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283531 (or 283521 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 18145216 is about 4259.7201786033. The cubic root of 18145216 is about 262.7770185171. Note that the first 3 decimals are identical.

Adding to 18145216 its reverse (61254181), we get a palindrome (79399397).

The spelling of 18145216 in words is "eighteen million, one hundred forty-five thousand, two hundred sixteen".