18055800 has 144 divisors (see below), whose sum is σ = 69348240. Its totient is φ = 4124160.

The previous prime is 18055799. The next prime is 18055801. The reversal of 18055800 is 855081.

18055800 is a `hidden beast` number, since 1 + 80 + 5 + 580 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18055799) and next prime (18055801).

It is a super-3 number, since 3×18055800³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055801) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11884 + ... + 13316.

It is an arithmetic number, because the mean of its divisors is an integer number (481585).

Almost surely, 2^18055800 is an apocalyptic number.

18055800 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 18055800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34674120).

18055800 is an abundant number, since it is smaller than the sum of its proper divisors (51292440).

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

18055800 is a wasteful number, since it uses less digits than its factorization.

18055800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1450 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 18055800 is about 4249.2116915965. The cubic root of 18055800 is about 262.3446700090.

The spelling of 18055800 in words is "eighteen million, fifty-five thousand, eight hundred".