17968817 has 2 divisors, whose sum is σ = 17968818. Its totient is φ = 17968816.

The previous prime is 17968801. The next prime is 17968823. The reversal of 17968817 is 71886971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10764961 + 7203856 = 3281^2 + 2684^2 .

It is a cyclic number.

It is not a de Polignac number, because 17968817 - 2⁴ = 17968801 is a prime.

It is not a weakly prime, because it can be changed into another prime (17968837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8984408 + 8984409.

It is an arithmetic number, because the mean of its divisors is an integer number (8984409).

Almost surely, 2^17968817 is an apocalyptic number.

It is an amenable number.

17968817 is a deficient number, since it is larger than the sum of its proper divisors (1).

17968817 is an equidigital number, since it uses as much as digits as its factorization.

17968817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 47.

The square root of 17968817 is about 4238.9641423348. The cubic root of 17968817 is about 261.9227138355.

The spelling of 17968817 in words is "seventeen million, nine hundred sixty-eight thousand, eight hundred seventeen".