163888393 has 2 divisors, whose sum is σ = 163888394. Its totient is φ = 163888392.

The previous prime is 163888343. The next prime is 163888399. The reversal of 163888393 is 393888361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105945849 + 57942544 = 10293^2 + 7612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163888393 is a prime.

It is not a weakly prime, because it can be changed into another prime (163888399) 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, 81944196 + 81944197.

It is an arithmetic number, because the mean of its divisors is an integer number (81944197).

Almost surely, 2^163888393 is an apocalyptic number.

It is an amenable number.

163888393 is a deficient number, since it is larger than the sum of its proper divisors (1).

163888393 is an equidigital number, since it uses as much as digits as its factorization.

163888393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 49.

The square root of 163888393 is about 12801.8902119960. The cubic root of 163888393 is about 547.2461718949.

The spelling of 163888393 in words is "one hundred sixty-three million, eight hundred eighty-eight thousand, three hundred ninety-three".