18400368 has 80 divisors (see below), whose sum is σ = 56710656. Its totient is φ = 5026560.

The previous prime is 18400351. The next prime is 18400373. The reversal of 18400368 is 86300481.

It is a happy number.

It is a super-3 number, since 3×18400368³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6538 + ... + 8918.

Almost surely, 2^18400368 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 18400368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28355328).

18400368 is an abundant number, since it is smaller than the sum of its proper divisors (38310288).

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

18400368 is a wasteful number, since it uses less digits than its factorization.

18400368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422 (or 2416 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18400368 is about 4289.5650129121. The cubic root of 18400368 is about 264.0029843556.

The spelling of 18400368 in words is "eighteen million, four hundred thousand, three hundred sixty-eight".