18318747 has 4 divisors (see below), whose sum is σ = 24425000. Its totient is φ = 12212496.

The previous prime is 18318709. The next prime is 18318779. The reversal of 18318747 is 74781381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74781381 = 3 ⋅24927127.

It is not a de Polignac number, because 18318747 - 2⁶ = 18318683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18318347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3053122 + ... + 3053127.

It is an arithmetic number, because the mean of its divisors is an integer number (6106250).

Almost surely, 2^18318747 is an apocalyptic number.

18318747 is a deficient number, since it is larger than the sum of its proper divisors (6106253).

18318747 is an equidigital number, since it uses as much as digits as its factorization.

18318747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6106252.

The product of its digits is 37632, while the sum is 39.

The square root of 18318747 is about 4280.0405371912. The cubic root of 18318747 is about 263.6120478312.

The spelling of 18318747 in words is "eighteen million, three hundred eighteen thousand, seven hundred forty-seven".