18518013 has 12 divisors (see below), whose sum is σ = 27911520. Its totient is φ = 11808456.

The previous prime is 18518009. The next prime is 18518033. The reversal of 18518013 is 31081581.

It is not a de Polignac number, because 18518013 - 2² = 18518009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44523 + ... + 44936.

It is an arithmetic number, because the mean of its divisors is an integer number (2325960).

Almost surely, 2^18518013 is an apocalyptic number.

It is an amenable number.

18518013 is a deficient number, since it is larger than the sum of its proper divisors (9393507).

18518013 is a wasteful number, since it uses less digits than its factorization.

18518013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89488 (or 89485 counting only the distinct ones).

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

The square root of 18518013 is about 4303.2560927744. The cubic root of 18518013 is about 264.5644345909.

Adding to 18518013 its reverse (31081581), we get a palindrome (49599594).

It can be divided in two parts, 185180 and 13, that added together give a cube (185193 = 57³).

The spelling of 18518013 in words is "eighteen million, five hundred eighteen thousand, thirteen".