18000313 has 4 divisors (see below), whose sum is σ = 18009088. Its totient is φ = 17991540.

The previous prime is 18000259. The next prime is 18000319. The reversal of 18000313 is 31300081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18000313 - 2⁹ = 17999801 is a prime.

It is a super-2 number, since 2×18000313² = 648022536195938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18000319) 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, 520 + ... + 6022.

It is an arithmetic number, because the mean of its divisors is an integer number (4502272).

Almost surely, 2^18000313 is an apocalyptic number.

It is an amenable number.

18000313 is a deficient number, since it is larger than the sum of its proper divisors (8775).

18000313 is an equidigital number, since it uses as much as digits as its factorization.

18000313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8774.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 18000313 is about 4242.6775743627. The cubic root of 18000313 is about 262.0756584714.

Adding to 18000313 its reverse (31300081), we get a palindrome (49300394).

The spelling of 18000313 in words is "eighteen million, three hundred thirteen", and thus it is an aban number.