16409993 has 2 divisors, whose sum is σ = 16409994. Its totient is φ = 16409992.

The previous prime is 16409989. The next prime is 16410007. The reversal of 16409993 is 39990461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13053769 + 3356224 = 3613^2 + 1832^2 .

It is a cyclic number.

It is not a de Polignac number, because 16409993 - 2² = 16409989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16409993.

It is not a weakly prime, because it can be changed into another prime (16409933) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8204996 + 8204997.

It is an arithmetic number, because the mean of its divisors is an integer number (8204997).

Almost surely, 2^16409993 is an apocalyptic number.

It is an amenable number.

16409993 is a deficient number, since it is larger than the sum of its proper divisors (1).

16409993 is an equidigital number, since it uses as much as digits as its factorization.

16409993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 16409993 is about 4050.9249561057. The cubic root of 16409993 is about 254.1184115264.

The spelling of 16409993 in words is "sixteen million, four hundred nine thousand, nine hundred ninety-three".