18000347 has 2 divisors, whose sum is σ = 18000348. Its totient is φ = 18000346.

The previous prime is 18000343. The next prime is 18000349. The reversal of 18000347 is 74300081.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18000347 - 2² = 18000343 is a prime.

Together with 18000349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18000343) 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 as a sum of consecutive naturals, namely, 9000173 + 9000174.

It is an arithmetic number, because the mean of its divisors is an integer number (9000174).

Almost surely, 2^18000347 is an apocalyptic number.

18000347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000347 is an equidigital number, since it uses as much as digits as its factorization.

18000347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 18000347 is about 4242.6815812644. The cubic root of 18000347 is about 262.0758234791.

The spelling of 18000347 in words is "eighteen million, three hundred forty-seven", and thus it is an aban number.