18693413 has 2 divisors, whose sum is σ = 18693414. Its totient is φ = 18693412.

The previous prime is 18693373. The next prime is 18693427. The reversal of 18693413 is 31439681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15864289 + 2829124 = 3983^2 + 1682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18693413 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 (18693613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9346706 + 9346707.

It is an arithmetic number, because the mean of its divisors is an integer number (9346707).

Almost surely, 2^18693413 is an apocalyptic number.

It is an amenable number.

18693413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18693413 is an equidigital number, since it uses as much as digits as its factorization.

18693413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 18693413 is about 4323.5879775945. The cubic root of 18693413 is about 265.3971167178.

The spelling of 18693413 in words is "eighteen million, six hundred ninety-three thousand, four hundred thirteen".