18513018 has 48 divisors (see below), whose sum is σ = 41633280. Its totient is φ = 5941728.

The previous prime is 18512981. The next prime is 18513023. The reversal of 18513018 is 81031581.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18512982 and 18513000.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66696 + ... + 66972.

It is an arithmetic number, because the mean of its divisors is an integer number (867360).

Almost surely, 2^18513018 is an apocalyptic number.

18513018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18513018 is an abundant number, since it is smaller than the sum of its proper divisors (23120262).

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

18513018 is a wasteful number, since it uses less digits than its factorization.

18513018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 18513018 is about 4302.6756791559. The cubic root of 18513018 is about 264.5406448141.

Adding to 18513018 its reverse (81031581), we get a palindrome (99544599).

It can be divided in two parts, 185 and 13018, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 18513018 in words is "eighteen million, five hundred thirteen thousand, eighteen".