18006413 has 2 divisors, whose sum is σ = 18006414. Its totient is φ = 18006412.

The previous prime is 18006389. The next prime is 18006431. The reversal of 18006413 is 31460081.

Together with next prime (18006431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 3364 = 4243^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 18006413 - 2²⁴ = 1229197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18006113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9003206 + 9003207.

It is an arithmetic number, because the mean of its divisors is an integer number (9003207).

Almost surely, 2^18006413 is an apocalyptic number.

It is an amenable number.

18006413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18006413 is an equidigital number, since it uses as much as digits as its factorization.

18006413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18006413 is about 4243.3963991124. The cubic root of 18006413 is about 262.1052594561.

Adding to 18006413 its reverse (31460081), we get a palindrome (49466494).

The spelling of 18006413 in words is "eighteen million, six thousand, four hundred thirteen".