18232416 has 144 divisors (see below), whose sum is σ = 56019600. Its totient is φ = 5612544.

The previous prime is 18232397. The next prime is 18232427. The reversal of 18232416 is 61423281.

18232416 is a `hidden beast` number, since 18 + 232 + 416 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 18232416.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308995 + ... + 309053.

It is an arithmetic number, because the mean of its divisors is an integer number (389025).

Almost surely, 2^18232416 is an apocalyptic number.

18232416 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 18232416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28009800).

18232416 is an abundant number, since it is smaller than the sum of its proper divisors (37787184).

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

18232416 is a wasteful number, since it uses less digits than its factorization.

18232416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 130 counting only the distinct ones).

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

The square root of 18232416 is about 4269.9433251508. The cubic root of 18232416 is about 263.1972862745.

Adding to 18232416 its reverse (61423281), we get a palindrome (79655697).

The spelling of 18232416 in words is "eighteen million, two hundred thirty-two thousand, four hundred sixteen".