18055872 has 126 divisors (see below), whose sum is σ = 54991508. Its totient is φ = 5878656.

The previous prime is 18055859. The next prime is 18055879. The reversal of 18055872 is 27855081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18055879) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 419883 + ... + 419925.

Almost surely, 2^18055872 is an apocalyptic number.

18055872 is a gapful number since it is divisible by the number (12) 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 18055872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27495754).

18055872 is an abundant number, since it is smaller than the sum of its proper divisors (36935636).

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

18055872 is an frugal number, since it uses more digits than its factorization.

18055872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 18055872 is about 4249.2201637477. The cubic root of 18055872 is about 262.3450187204.

The spelling of 18055872 in words is "eighteen million, fifty-five thousand, eight hundred seventy-two".