18108240 has 80 divisors (see below), whose sum is σ = 56567808. Its totient is φ = 4791808.

The previous prime is 18108239. The next prime is 18108253. The reversal of 18108240 is 4280181.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18108240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47089 + ... + 47471.

Almost surely, 2^18108240 is an apocalyptic number.

18108240 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 18108240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28283904).

18108240 is an abundant number, since it is smaller than the sum of its proper divisors (38459568).

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

18108240 is a wasteful number, since it uses less digits than its factorization.

18108240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18108240 is about 4255.3777740642. The cubic root of 18108240 is about 262.5984030165.

The spelling of 18108240 in words is "eighteen million, one hundred eight thousand, two hundred forty".