18027840 has 112 divisors (see below), whose sum is σ = 58155840. Its totient is φ = 4730880.

The previous prime is 18027829. The next prime is 18027847. The reversal of 18027840 is 4872081.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18027798 and 18027807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18027847) 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, 85335 + ... + 85545.

Almost surely, 2^18027840 is an apocalyptic number.

18027840 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 18027840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29077920).

18027840 is an abundant number, since it is smaller than the sum of its proper divisors (40128000).

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

18027840 is a wasteful number, since it uses less digits than its factorization.

18027840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18027840 is about 4245.9203949203. The cubic root of 18027840 is about 262.2091836006.

The spelling of 18027840 in words is "eighteen million, twenty-seven thousand, eight hundred forty".