18512013 has 8 divisors (see below), whose sum is σ = 26581408. Its totient is φ = 11391984.

The previous prime is 18511979. The next prime is 18512029. The reversal of 18512013 is 31021581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18512013 - 2⁶ = 18511949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512113) 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, 237295 + ... + 237372.

It is an arithmetic number, because the mean of its divisors is an integer number (3322676).

Almost surely, 2^18512013 is an apocalyptic number.

18512013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18512013 is a deficient number, since it is larger than the sum of its proper divisors (8069395).

18512013 is a wasteful number, since it uses less digits than its factorization.

18512013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474683.

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

The square root of 18512013 is about 4302.5588897771. The cubic root of 18512013 is about 264.5358577654.

Adding to 18512013 its reverse (31021581), we get a palindrome (49533594).

The spelling of 18512013 in words is "eighteen million, five hundred twelve thousand, thirteen".