18616400 has 60 divisors (see below), whose sum is σ = 48803424. Its totient is φ = 6768000.

The previous prime is 18616391. The next prime is 18616417. The reversal of 18616400 is 461681.

It is a self number, because there is not a number n which added to its sum of digits gives 18616400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2285 + ... + 6515.

Almost surely, 2^18616400 is an apocalyptic number.

18616400 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 18616400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24401712).

18616400 is an abundant number, since it is smaller than the sum of its proper divisors (30187024).

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

18616400 is a wasteful number, since it uses less digits than its factorization.

18616400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4260 (or 4249 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18616400 is about 4314.6726411166. The cubic root of 18616400 is about 265.0321546363.

The spelling of 18616400 in words is "eighteen million, six hundred sixteen thousand, four hundred".