18240512 has 44 divisors (see below), whose sum is σ = 37337280. Its totient is φ = 8902656.

The previous prime is 18240511. The next prime is 18240517. The reversal of 18240512 is 21504281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47939 + ... + 48317.

Almost surely, 2^18240512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18240512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18668640).

18240512 is an abundant number, since it is smaller than the sum of its proper divisors (19096768).

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

18240512 is an equidigital number, since it uses as much as digits as its factorization.

18240512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18240512 is about 4270.8912418838. The cubic root of 18240512 is about 263.2362375927.

Adding to 18240512 its reverse (21504281), we get a palindrome (39744793).

The spelling of 18240512 in words is "eighteen million, two hundred forty thousand, five hundred twelve".