18530240 has 56 divisors (see below), whose sum is σ = 44744640. Its totient is φ = 7308288.

The previous prime is 18530233. The next prime is 18530251. The reversal of 18530240 is 4203581.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24914 + ... + 25646.

Almost surely, 2^18530240 is an apocalyptic number.

18530240 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 18530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22372320).

18530240 is an abundant number, since it is smaller than the sum of its proper divisors (26214400).

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

18530240 is an equidigital number, since it uses as much as digits as its factorization.

18530240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 18530240 is about 4304.6765267555. The cubic root of 18530240 is about 264.6226502977.

The spelling of 18530240 in words is "eighteen million, five hundred thirty thousand, two hundred forty".