18384313 has 4 divisors (see below), whose sum is σ = 18573940. Its totient is φ = 18194688.

The previous prime is 18384307. The next prime is 18384319. The reversal of 18384313 is 31348381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31348381 = 89 ⋅352229.

It is an interprime number because it is at equal distance from previous prime (18384307) and next prime (18384319).

It can be written as a sum of positive squares in 2 ways, for example, as 4782969 + 13601344 = 2187^2 + 3688^2 .

It is a cyclic number.

It is not a de Polignac number, because 18384313 - 2⁹ = 18383801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18384319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94668 + ... + 94861.

It is an arithmetic number, because the mean of its divisors is an integer number (4643485).

Almost surely, 2^18384313 is an apocalyptic number.

It is an amenable number.

18384313 is a deficient number, since it is larger than the sum of its proper divisors (189627).

18384313 is an equidigital number, since it uses as much as digits as its factorization.

18384313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189626.

The product of its digits is 6912, while the sum is 31.

The square root of 18384313 is about 4287.6932026441. The cubic root of 18384313 is about 263.9261778975.

The spelling of 18384313 in words is "eighteen million, three hundred eighty-four thousand, three hundred thirteen".