16973993 has 2 divisors, whose sum is σ = 16973994. Its totient is φ = 16973992.

The previous prime is 16973987. The next prime is 16974031. The reversal of 16973993 is 39937961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12759184 + 4214809 = 3572^2 + 2053^2 .

It is a cyclic number.

It is not a de Polignac number, because 16973993 - 2¹⁶ = 16908457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16973923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8486996 + 8486997.

It is an arithmetic number, because the mean of its divisors is an integer number (8486997).

Almost surely, 2^16973993 is an apocalyptic number.

It is an amenable number.

16973993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16973993 is an equidigital number, since it uses as much as digits as its factorization.

16973993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 47.

The square root of 16973993 is about 4119.9506065000. The cubic root of 16973993 is about 256.9969719094.

The spelling of 16973993 in words is "sixteen million, nine hundred seventy-three thousand, nine hundred ninety-three".