18012013 has 4 divisors (see below), whose sum is σ = 18795168. Its totient is φ = 17228860.

The previous prime is 18011977. The next prime is 18012017. The reversal of 18012013 is 31021081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18012013 - 2²¹ = 15914861 is a prime.

It is a super-2 number, since 2×18012013² = 648865224624338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391543 + ... + 391588.

It is an arithmetic number, because the mean of its divisors is an integer number (4698792).

Almost surely, 2^18012013 is an apocalyptic number.

It is an amenable number.

18012013 is a deficient number, since it is larger than the sum of its proper divisors (783155).

18012013 is an equidigital number, since it uses as much as digits as its factorization.

18012013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783154.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 18012013 is about 4244.0561966119. The cubic root of 18012013 is about 262.1324282453.

Adding to 18012013 its reverse (31021081), we get a palindrome (49033094).

The spelling of 18012013 in words is "eighteen million, twelve thousand, thirteen".