18013512 has 48 divisors (see below), whose sum is σ = 49507920. Its totient is φ = 5457760.

The previous prime is 18013507. The next prime is 18013529. The reversal of 18013512 is 21531081.

It is a super-2 number, since 2×18013512² = 648973229148288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198 + ... + 6005.

It is an arithmetic number, because the mean of its divisors is an integer number (1031415).

Almost surely, 2^18013512 is an apocalyptic number.

18013512 is a gapful number since it is divisible by the number (12) 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 18013512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24753960).

18013512 is an abundant number, since it is smaller than the sum of its proper divisors (31494408).

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

18013512 is a wasteful number, since it uses less digits than its factorization.

18013512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6234 (or 6219 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 18013512 is about 4244.2327928614. The cubic root of 18013512 is about 262.1396997925.

Adding to 18013512 its reverse (21531081), we get a palindrome (39544593).

The spelling of 18013512 in words is "eighteen million, thirteen thousand, five hundred twelve".