18480313 has 4 divisors (see below), whose sum is σ = 18598180. Its totient is φ = 18362448.

The previous prime is 18480289. The next prime is 18480317. The reversal of 18480313 is 31308481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31308481 = 31 ⋅1009951.

It can be written as a sum of positive squares in 2 ways, for example, as 6390784 + 12089529 = 2528^2 + 3477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18480313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18480317) 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, 58698 + ... + 59011.

It is an arithmetic number, because the mean of its divisors is an integer number (4649545).

Almost surely, 2^18480313 is an apocalyptic number.

It is an amenable number.

18480313 is a deficient number, since it is larger than the sum of its proper divisors (117867).

18480313 is a wasteful number, since it uses less digits than its factorization.

18480313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117866.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18480313 is about 4298.8734570815. The cubic root of 18480313 is about 264.3847742885.

Adding to 18480313 its reverse (31308481), we get a palindrome (49788794).

The spelling of 18480313 in words is "eighteen million, four hundred eighty thousand, three hundred thirteen".