18345207 has 4 divisors (see below), whose sum is σ = 24460280. Its totient is φ = 12230136.

The previous prime is 18345199. The next prime is 18345209. The reversal of 18345207 is 70254381.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18345207 - 2³ = 18345199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18345209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3057532 + ... + 3057537.

It is an arithmetic number, because the mean of its divisors is an integer number (6115070).

Almost surely, 2^18345207 is an apocalyptic number.

18345207 is a deficient number, since it is larger than the sum of its proper divisors (6115073).

18345207 is an equidigital number, since it uses as much as digits as its factorization.

18345207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115072.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18345207 is about 4283.1305140049. The cubic root of 18345207 is about 263.7389091119.

Adding to 18345207 its reverse (70254381), we get a palindrome (88599588).

The spelling of 18345207 in words is "eighteen million, three hundred forty-five thousand, two hundred seven".