18234216 has 288 divisors, whose sum is σ = 69713280. Its totient is φ = 4181760.

The previous prime is 18234211. The next prime is 18234221. The reversal of 18234216 is 61243281.

It is an interprime number because it is at equal distance from previous prime (18234211) and next prime (18234221).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18234216.

It is not an unprimeable number, because it can be changed into a prime (18234211) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 792781 + ... + 792803.

It is an arithmetic number, because the mean of its divisors is an integer number (242060).

Almost surely, 2^18234216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18234216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34856640).

18234216 is an abundant number, since it is smaller than the sum of its proper divisors (51479064).

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

18234216 is a wasteful number, since it uses less digits than its factorization.

18234216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 59 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 18234216 is about 4270.1540955802. The cubic root of 18234216 is about 263.2059473963.

Adding to 18234216 its reverse (61243281), we get a palindrome (79477497).

The spelling of 18234216 in words is "eighteen million, two hundred thirty-four thousand, two hundred sixteen".