18006380 has 48 divisors (see below), whose sum is σ = 44283456. Its totient is φ = 6021120.

The previous prime is 18006377. The next prime is 18006389. The reversal of 18006380 is 8360081.

It is not an unprimeable number, because it can be changed into a prime (18006389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4172 + ... + 7308.

It is an arithmetic number, because the mean of its divisors is an integer number (922572).

Almost surely, 2^18006380 is an apocalyptic number.

18006380 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 18006380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22141728).

18006380 is an abundant number, since it is smaller than the sum of its proper divisors (26277076).

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

18006380 is a wasteful number, since it uses less digits than its factorization.

18006380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194 (or 3192 counting only the distinct ones).

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

The square root of 18006380 is about 4243.3925107159. The cubic root of 18006380 is about 262.1050993376.

The spelling of 18006380 in words is "eighteen million, six thousand, three hundred eighty".