18216000 has 336 divisors, whose sum is σ = 74176128. Its totient is φ = 4224000.

The previous prime is 18215983. The next prime is 18216017. The reversal of 18216000 is 61281.

It is an interprime number because it is at equal distance from previous prime (18215983) and next prime (18216017).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 791989 + ... + 792011.

Almost surely, 2^18216000 is an apocalyptic number.

18216000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18216000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37088064).

18216000 is an abundant number, since it is smaller than the sum of its proper divisors (55960128).

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

18216000 is a wasteful number, since it uses less digits than its factorization.

18216000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18216000 is about 4268.0206185069. The cubic root of 18216000 is about 263.1182705252.

Adding to 18216000 its reverse (61281), we get a palindrome (18277281).

The spelling of 18216000 in words is "eighteen million, two hundred sixteen thousand".