18188016 has 240 divisors, whose sum is σ = 64460160. Its totient is φ = 4354560.

The previous prime is 18187987. The next prime is 18188033. The reversal of 18188016 is 61088181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 491550 + ... + 491586.

It is an arithmetic number, because the mean of its divisors is an integer number (268584).

Almost surely, 2^18188016 is an apocalyptic number.

18188016 is a gapful number since it is divisible by the number (16) 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 18188016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32230080).

18188016 is an abundant number, since it is smaller than the sum of its proper divisors (46272144).

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

18188016 is a wasteful number, since it uses less digits than its factorization.

18188016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 18188016 is about 4264.7410237903. The cubic root of 18188016 is about 262.9834645784.

The spelling of 18188016 in words is "eighteen million, one hundred eighty-eight thousand, sixteen".