12345818 has 4 divisors (see below), whose sum is σ = 18518730. Its totient is φ = 6172908.

The previous prime is 12345811. The next prime is 12345847. The reversal of 12345818 is 81854321.

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

It can be written as a sum of positive squares in only one way, i.e., 12061729 + 284089 = 3473^2 + 533^2 .

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12345811) 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, 3086453 + ... + 3086456.

Almost surely, 2^12345818 is an apocalyptic number.

12345818 is a deficient number, since it is larger than the sum of its proper divisors (6172912).

12345818 is an equidigital number, since it uses as much as digits as its factorization.

12345818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172911.

The product of its digits is 7680, while the sum is 32.

The square root of 12345818 is about 3513.6616228658. The cubic root of 12345818 is about 231.1212920982.

The spelling of 12345818 in words is "twelve million, three hundred forty-five thousand, eight hundred eighteen".