17381993 has 2 divisors, whose sum is σ = 17381994. Its totient is φ = 17381992.

The previous prime is 17381989. The next prime is 17382023. The reversal of 17381993 is 39918371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17081689 + 300304 = 4133^2 + 548^2 .

It is a cyclic number.

It is not a de Polignac number, because 17381993 - 2² = 17381989 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 17381993.

It is not a weakly prime, because it can be changed into another prime (17381953) 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, 8690996 + 8690997.

It is an arithmetic number, because the mean of its divisors is an integer number (8690997).

Almost surely, 2^17381993 is an apocalyptic number.

It is an amenable number.

17381993 is a deficient number, since it is larger than the sum of its proper divisors (1).

17381993 is an equidigital number, since it uses as much as digits as its factorization.

17381993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 17381993 is about 4169.1717402861. The cubic root of 17381993 is about 259.0398163818.

The spelling of 17381993 in words is "seventeen million, three hundred eighty-one thousand, nine hundred ninety-three".