18318002 has 4 divisors (see below), whose sum is σ = 27477006. Its totient is φ = 9159000.

The previous prime is 18317989. The next prime is 18318007. The reversal of 18318002 is 20081381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20081381 = 607 ⋅33083.

It can be written as a sum of positive squares in only one way, i.e., 13169641 + 5148361 = 3629^2 + 2269^2 .

It is not an unprimeable number, because it can be changed into a prime (18318007) 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 as a sum of consecutive naturals, namely, 4579499 + ... + 4579502.

Almost surely, 2^18318002 is an apocalyptic number.

18318002 is a deficient number, since it is larger than the sum of its proper divisors (9159004).

18318002 is an equidigital number, since it uses as much as digits as its factorization.

18318002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9159003.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18318002 is about 4279.9535044203. The cubic root of 18318002 is about 263.6084741946.

Adding to 18318002 its reverse (20081381), we get a palindrome (38399383).

It can be divided in two parts, 18 and 318002, that multiplied together give a triangular number (5724036 = T₃₃₈₃).

The spelling of 18318002 in words is "eighteen million, three hundred eighteen thousand, two".