163888889 has 8 divisors (see below), whose sum is σ = 178464000. Its totient is φ = 149908752.

The previous prime is 163888877. The next prime is 163888913. The reversal of 163888889 is 988888361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163888889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163888189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148169 + ... + 149270.

It is an arithmetic number, because the mean of its divisors is an integer number (22308000).

Almost surely, 2^163888889 is an apocalyptic number.

163888889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

163888889 is a deficient number, since it is larger than the sum of its proper divisors (14575111).

163888889 is a wasteful number, since it uses less digits than its factorization.

163888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297487.

The product of its digits is 5308416, while the sum is 59.

The square root of 163888889 is about 12801.9095841206. The cubic root of 163888889 is about 547.2467239654.

The spelling of 163888889 in words is "one hundred sixty-three million, eight hundred eighty-eight thousand, eight hundred eighty-nine".