17968213 has 2 divisors, whose sum is σ = 17968214. Its totient is φ = 17968212.

The previous prime is 17968207. The next prime is 17968217. The reversal of 17968213 is 31286971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 7569 = 4238^2 + 87^2 .

It is a cyclic number.

It is not a de Polignac number, because 17968213 - 2⁹ = 17967701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17968217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8984106 + 8984107.

It is an arithmetic number, because the mean of its divisors is an integer number (8984107).

Almost surely, 2^17968213 is an apocalyptic number.

It is an amenable number.

17968213 is a deficient number, since it is larger than the sum of its proper divisors (1).

17968213 is an equidigital number, since it uses as much as digits as its factorization.

17968213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 17968213 is about 4238.8928979157. The cubic root of 17968213 is about 261.9197790644.

It can be divided in two parts, 17968 and 213, that added together give a palindrome (18181).

The spelling of 17968213 in words is "seventeen million, nine hundred sixty-eight thousand, two hundred thirteen".