18241540 has 24 divisors (see below), whose sum is σ = 39032280. Its totient is φ = 7158528.

The previous prime is 18241537. The next prime is 18241541. The reversal of 18241540 is 4514281.

It can be written as a sum of positive squares in 4 ways, for example, as 2937796 + 15303744 = 1714^2 + 3912^2 .

It is not an unprimeable number, because it can be changed into a prime (18241541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7545 + ... + 9664.

It is an arithmetic number, because the mean of its divisors is an integer number (1626345).

Almost surely, 2^18241540 is an apocalyptic number.

18241540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18241540 is an abundant number, since it is smaller than the sum of its proper divisors (20790740).

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

18241540 is a wasteful number, since it uses less digits than its factorization.

18241540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17271 (or 17269 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 18241540 is about 4271.0115897759. The cubic root of 18241540 is about 263.2411826616.

It can be divided in two parts, 18241 and 540, that added together give a palindrome (18781).

The spelling of 18241540 in words is "eighteen million, two hundred forty-one thousand, five hundred forty".