16399393 has 2 divisors, whose sum is σ = 16399394. Its totient is φ = 16399392.

The previous prime is 16399363. The next prime is 16399421. The reversal of 16399393 is 39399361.

16399393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11785489 + 4613904 = 3433^2 + 2148^2 .

It is an emirp because it is prime and its reverse (39399361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16399393 - 2¹⁷ = 16268321 is a prime.

It is not a weakly prime, because it can be changed into another prime (16399343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199696 + 8199697.

It is an arithmetic number, because the mean of its divisors is an integer number (8199697).

Almost surely, 2^16399393 is an apocalyptic number.

It is an amenable number.

16399393 is a deficient number, since it is larger than the sum of its proper divisors (1).

16399393 is an equidigital number, since it uses as much as digits as its factorization.

16399393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 43.

The square root of 16399393 is about 4049.6164015867. The cubic root of 16399393 is about 254.0636839923.

The spelling of 16399393 in words is "sixteen million, three hundred ninety-nine thousand, three hundred ninety-three".