18130506 has 8 divisors (see below), whose sum is σ = 36261024. Its totient is φ = 6043500.

The previous prime is 18130493. The next prime is 18130507. The reversal of 18130506 is 60503181.

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

18130506 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18130507) 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, 1510870 + ... + 1510881.

It is an arithmetic number, because the mean of its divisors is an integer number (4532628).

Almost surely, 2^18130506 is an apocalyptic number.

18130506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18130506 is a wasteful number, since it uses less digits than its factorization.

18130506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021756.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 18130506 is about 4257.9931892853. The cubic root of 18130506 is about 262.7059897867.

Adding to 18130506 its reverse (60503181), we get a palindrome (78633687).

The spelling of 18130506 in words is "eighteen million, one hundred thirty thousand, five hundred six".